Development of a transmission model for dengue virus
© Christofferson et al.; licensee BioMed Central Ltd. 2013
Received: 10 December 2012
Accepted: 11 April 2013
Published: 23 April 2013
Dengue virus (DENV) research has historically been hampered by the lack of a susceptible vertebrate transmission model. Recently, there has been progress towards such models using several varieties of knockout mice, particularly those deficient in type I and II interferon receptors. Based on the critical nature of the type I interferon response in limiting DENV infection establishment, we assessed the permissiveness of a mouse strain with a blunted type I interferon response via gene deficiencies in interferon regulatory factors 3 and 7 (IRF3/7 −/− −/−) with regards to DENV transmission success. We investigated the possibility of transmission to the mouse by needle and infectious mosquito, and subsequent transmission back to mosquito from an infected animal during its viremic period.
Mice were inoculated subcutaneously with non-mouse adapted DENV-2 strain 1232 and serum was tested for viral load and cytokine production each day. Additionally, mosquitoes were orally challenged with the same DENV-2 strain via artificial membrane feeder, and then allowed to forage or naïve mice. Subsequently, we determined acquisition potential by allowing naïve mosquitoes on forage on exposed mice during their viremic period.
Both needle inoculation and infectious mosquito bite(s) resulted in 100% infection. Significant differences between these groups in viremia on the two days leading to peak viremia were observed, though no significant difference in cytokine production was seen. Through our determination of transmission and acquisition potentials, the transmission cycle (mouse-to mosquito-to mouse) was completed. We confirmed that the IRF3/7 −/− −/− mouse supports DENV replication and is competent for transmission experiments, with the ability to use a non-mouse adapted DENV-2 strain. A significant finding of this study was that this IRF3/7 −/− −/− mouse strain was able to be infected by and transmit virus to mosquitoes, thus providing means to replicate the natural transmission cycle of DENV.
As there is currently no approved vaccine for DENV, public health monitoring and a greater understanding of transmission dynamics leading to outbreak events are critical. The further characterization of DENV using this model will expand knowledge of key entomological, virological and immunological components of infection establishment and transmission events.
KeywordsDengue Transmission Arbovirus Mouse
Dengue virus (DENV) is the most common arboviral infection of humans, infecting tens of millions of people each year in tropical areas . There is presently no vaccine available for DENV and reducing transmission via mosquito control efforts has not yet been sufficient to alter the trajectory of the pandemic . DENV is efficiently spread from mosquito to human and back through a domestic cycle that is easily described on a superficial level; however, numerous studies have suggested that our accounting of the factors involved in hyperendemic, community, and inter-annual transmission, among others, remains poorly characterized. It is widely agreed that enhancing our understanding of these variable transmission determinants is vital to controlling outbreaks [3–6]. However, characterization of these factors and their relative importance on transmission has been complicated by the lack of a suitable laboratory model for DENV transmission.
In vitro studies have shown either that DENV inhibits type I IFN production or that lack of type I IFN response renders mice susceptible, indicating that this mechanism of immune response subversion is critical for DENV fitness and thus affects transmission [16–18]. Further, others have shown that downstream protein expression induced by type I IFN and the (Janus kinase) JAK/STAT pathway play important roles in DENV inhibition [17–21]. Much attention has been given to this JAK/STAT pathway and it has been suggested that DENV viral mediated subversion of the type I IFN response occurs only after this pathway has been initiated [20, 22].
Recently, there has been progress towards DENV vertebrate infection models based on these findings with successful studies involving several knockout mice, particularly the AG129 model deficient in type I and II interferon receptors and a more recent C57BL/6 mouse deficient in type I IFN receptors [18, 23–29]. These animals have most often been used to model DENV disease and pathogenesis, especially the severe forms of disease [29–34]. Humanized mice have also shown great promise for investigating DENV pathogenesis as well as transmission [34, 35]. This is the exception, however, as the use of many of these animal models for DENV transmission experiments has yet to be explored.
Accordingly, we assessed the permissiveness of a strain of C57BL/6 mouse lacking IRF3 and IRF7 (IRF3/7 −/− −/−) with respect to the transmission of non-mouse adapted DENV [18, 36–38]. Specifically, we investigated the possibility of non-mouse adapted DENV transmission to this mouse strain by needle inoculation or via infectious mosquito bite. Subsequently, we determined the potential for transmission back to mosquitoes from a viremic animal. Others have established the crucial role of type I IFN in early clearance of DENV, though none have sought to explore infection establishment . In addition, some studies have indicated both types I and II IFN are necessary for disease progression [17, 39–41]. Herein, we also investigated critical innate immune markers of progression, comparing infection establishment and kinetic differences from needle inoculation to that of Aedes aegypti mosquito transmission, as mosquito saliva and salivary gland proteins are known to affect pathogen transmission and/or disease progression [35, 42–45].
Permissive transmission model
Mosquito versus needle transmission
Kinetics of transmission and number of inoculating mosquitoes
Summary of transmission from mosquito to IRF3/7 −/− −/− mice
No. of infectious mosquitoes
Day of viremia onset (dpi)
Recapitulation of transmission cycle
We confirmed that the IRF3/7 −/− −/− mouse is a susceptible vertebrate model for DENV infection and transmission. It has the ability to support non-mouse adapted DENV strains of serotype 2. Though viral loads did not approach those seen in human DENV cases, we confirmed that the virus was actively replicating, and therefore the observed viremia and transmission events were not due to the initial inoculum acting as a contaminant.
Our finding that DENV was no longer detectable following the peak of IFN-γ in these mice reaffirms the role of the IFN-γ response in the clearance of DENV infection [46, 47]. This response mirrors the correlation between IFN-γ response and viremia cessation observed in children with DENV [46, 48]. The association between IFN-γ response and viremia supports the use of transmission models with intact IFN- γ responses and suggests the potential to use this IRF3/7 −/− −/− mouse for further inferential efforts to characterize the mechanism of DENV transmission to humans.
Some differences were noted in the IFN-γ response in mosquito exposed versus needle-inoculated mice, but the significance of these differences warrants further study. Studies have shown that interferon-γ-inducible protein 10 (IP-10/CXCL10) is an important chemokine in DENV infection, as DENV resistance has been correlated to increased levels of IP-10 [17, 49, 50]. More specifically, others have shown that DENV interacts with cell surface heparan sulfate and that IP-10 directly inhibits this interaction and subsequent infection of new cells . This would suggest that delaying the peak of IFN-γ, and thus IP-10, would widen the window for successful replication and infection of new cells. The mechanistic origin of these differences, whether based in mosquito saliva or some intrinsic vertebrate or viral characteristic, requires investigation, but underscores the further importance of a transmission model with an intact IFN-γ response. An important limitation of this particular result is the measurement of systemic cytokine levels. It is likely that a more significant alteration of the vertebrate immune response would be seen at the bite site (due to mosquito salivary secretions) and not necessarily systemically. Therefore, it is important to continue to investigate the potential role of mosquito saliva in infection kinetics in this transmission model.
The finding that viremia was higher in mosquito-inoculated mice compared to needle inoculated mice is unsurprising, given that others have shown similar results with other mosquito borne viruses, such as West Nile . Further, others have shown that the course of dengue infection can be affected if delivered by infectious mosquito bite . It is important to note, however, that mosquitoes in Cox et al. were intrathoracically inoculated with virus, while our mosquitoes were orally challenged, representing a more natural course of virus replication within and subsequent transmission from the mosquito . While caution should be used when comparing the responses of humanized mice to those of non-humanized mice, our results also indicate an enhancement effect of mosquito bite on DENV infection, demonstrating successful DENV transmission with a single infectious mosquito (Table 1).
A significant finding of this study was that this IRF3/7 −/− −/− mouse strain was able to be both infected by and transmit virus to mosquitoes, thus providing means to replicate the natural transmission cycle of DENV. Completion of the transmission cycle was only successful in 1 out of 2 attempts, where mosquitoes were known to have disseminated infections. Since transmission was achieved in 100% of the other trials (including one other with only 1 infectious mosquito), it may be that the probability of transmission when only one infectious mosquito is feeding is less than 1. Indeed, this is consistent with another study that found consistent results (vRNA levels, clinical signs) only with greater than 4 mosquitoes . The ability of low levels of viremia seen in these infected mice to support transmission to mosquitoes and then subsequent transmission to other naïve mice confirms the presence of actively replicating, viable virus. The acquisition of infection by mosquitoes at these viremia levels suggests important ramifications for the role of low titer human infections (such as might occur in inapparent infections or transitional viremic periods) in overall transmission intensity. Endy, et al. estimated that over 60% of DENV infections in a school cohort were inapparent, and the results from this study point to the need for investigation into the implications for low viremic transmission [52, 53].
As there is currently no approved vaccine for DENV, public health monitoring and a greater understanding of transmission dynamics leading to outbreak events are critical for DENV prevention. The ability to achieve successful infection establishment using natural levels of viral inoculum from non-mouse adapted DENV strains is an important step towards studying transmission of DENV . Further, the recapitulation of the transmission cycle in this mouse could provide a tool with which to study the transmission dynamics and kinetics at the mosquito bite site. The further characterization of DENV using this model will expand our knowledge of key entomological, virological and immunological components to infection establishment and transmission events.
All experiments met the approval and conditions of the LSU Institutional Animal Care and Use Committee (protocol # 09–077). LSU IACUC procedures and policies adhere to and comply with the guidelines stated in the NIH Guide for the Care and Use of Laboratory Animals. Mice were maintained by laboratory staff and the Department of Laboratory Animal Medicine (DLAM) of the LSU School of Veterinary Medicine.
Mice were the generous gift of Dr. M. Diamond (Washington University, St. Louis, MO) with permission from Dr. T. Taniguchi (University of Tokyo, Tokyo, Japan). IRF3/7 −/− −/− (double knockout) mice are a strain of C57BL/6 mice that lack functional IRF 3 and 7, and thus have a stunted type I IFN response. The type II IFN response and all other immune responses are intact, though diminished . Control mice, wild type C57BL/6 mice, were also included and were obtained from the LSU DLAM.
Aedes aegypti (Rockefeller strain) mosquitoes used in this study come from a long-standing colony maintained at the LSU School of Veterinary Medicine. Mosquitoes are reared in constant environmental conditions and density. Mosquitoes have access to sucrose-soaked cotton ad libitum until 24 hours prior to experiments.
Strain 1232 of DENV serotype 2 (DENV-2 1232) virus was used in these experiments. This strain was originally isolated from a patient in Indonesia in 1978 (personal communication, R. Tesh). Virus was propagated in the C6/36 cell line (Aedes albopictus origin) prior to inoculation into mice to avoid adaptation to mammalian cells. Before inoculation, virus was titered via plaque assay on Vero cells and experimental titers from cell supernatant were confirmed at 106 PFU/mL by qRT-PCR as in . Thus, viral titers are expressed as PFU-equivalents/mL, symbolized as PFU*/mL. The resultant virus stock offered to mosquitoes via membrane feeder was passaged in Vero cells, in this case to avoid adaptation to insect cells.
Virus inoculation and serum collection
Mice (n = 5) were temporarily anesthetized with isoflurane and injected subcutaneously with 100 μl of supernatant from the virus inoculated cell culture. Thus, the total inoculum administered was 105 PFU/mouse of virus. We chose to needle-inoculate mice on the high end of the estimate from Styer 2007 et al. and Cox 2012 et al., so that a potential enhancement by mosquito delivery would not be attributable to a reduced inoculum in the needle group [35, 54]. Thus differences are a conservative estimate since mosquitoes may inoculate less than 105 PFU/mL.
Mice were then bled each day for five days via submandibular bleeding technique . Blood was allowed to clot for thirty minutes at room temperature and then centrifuged at 6000 rcf for four minutes. Clarified serum was collected and placed into a clean microcentrifuge tube for analysis.
vRNA was extracted using the MagMax-96 Total Nucleic Acid isolation kit (Ambion/Life Technologies, Carlsbad, CA) or QIamp Viral RNA Mini Kit (Qiagen, Valencia, CA). Serum samples were brought to volume where necessary with BA-1 diluent and kits were run per manufacturers’ instructions . Detection of vRNA was done using the One-Step TaqMan qRT-PCR assay (Life Technologies, Carlsbad, CA) as noted above .
Verification of viral replication in IRF3/7 −/− −/− mice
To verify that the mouse model supported active viral replication and that the viremia detected was not simply residual inoculum, we developed a complement strand assay to detect only actively replicating virus. From two mice inoculated with DENV in the same cohort as mentioned above, tissue surrounding the inoculation site and draining lymph nodes were harvested at 48 hours post-inoculation. The primers used amplified the region between nucleotides 1503–2418, covering the envelope protein (1503–2399) and nonstructural protein NS1 (2400–2418): FWD 5′ - GTG CTG CTG CAG ATG GAA GAC AAA - 3′; REV 5′ - TCA CAA CGC AAC CAC TAT CAG CCT - 3′. The reference nucleotide sequence used to generate the primers and from which the protein coding positions are taken is “DENV 2 isolate DENV-2/CO/BID-V3375/2007, complete genome” (GenBank: GQ868558.1). Also included were a positive control of freeze thawed, DENV-2 1232 infected Vero cell culture supernatant, and a negative control of uninfected, age matched Vero supernatant.
Reverse transcriptase (RT)-PCR amplification was carried out using the SuperScript™ III One-Step RT-PCR System with Platinum® Taq DNA Polymerase (Life Technologies, Carlsbad, CA) kit on the DNAEngine Peltier Thermal Cycler (BioRad) with the following protocol. RT Step (1 cycle): 55°C for 30 minutes, 4°C hold (indefinite), 94°C for 2 minutes. At the beginning of the RT step, only the forward primer is included in order to target only the negative sense RNA strand generated during DENV replication. During the 4°C hold, the tubes were removed and a primer mix containing both the forward and reverse primers is added. Tubes were replaced and the run continued. Amplification (40 cycles): 94°C for 15 seconds, 60°C for 30 seconds, 72°C for 1 minute. Final extension and Cool Down (1 cycle): 68°C for 5 minutes, 4°C hold. Samples were then run on a 1% agarose gel and bands visualized (Figure 2).
Mosquito exposure and transmission to IRF 3/7 −/− −/− mice
Mosquito inoculated infections occurred in two experimental runs (n1 = 7, n2 = 3, npooled = 10). The results from these ten mice were pooled as the “mosquito infected” cohort at LSU School of Veterinary Medicine, where environmental conditions are held steady. Mosquitoes are colony raised, experience consistent rearing conditions, and do not show the phenotypic plasticity seen in field caught mosquito populations.
Mosquitoes were offered an infectious blood meal containing DENV 3–5 days post emergence with an infectious titer of 106 PFU/mL. The blood meal consisted of bovine blood in Alsever’s anticoagulant (Hemostat, Dixon, CA) mixed 2:1 with a virus solution in a total volume of approximately 3 mL per carton of mosquitoes, heated to 37°C and kept warm via the Hemotek device (Discovery Workshops, Arrington, Lancashire, UK). Mosquitoes were allowed to feed for 45 minutes before the blood meal was removed. Each carton consisted of approximately 100 mosquitoes and seven cartons were fed for this study. Engorged females were separated and placed in new cartons and kept at constant environmental conditions (16:8 hours light:dark, 28°C, 70-80% humidity). Approximately 50% of mosquitoes were females, and nearly all fed to repletion before being returned to the aforementioned environmental conditions for nine days of extrinsic incubation. Subsequently, seven mice were anesthetized and placed on top of a carton containing approximately fifty DENV-exposed mosquitoes (1 mouse per carton). After twenty minutes, engorged mosquitoes were separated based on the presence of visible blood in the abdomen. Immediately after feeding on the mice, mosquitoes were frozen, their legs separated from their abdomens, and tested for virus. Testing was done via qRT-PCR on the Roche LightCycler 480 (Roche Diagnostics Corp., Indianapolis, IN) as previously described .
Transmission from viremic mice to mosquitoes
Three mice were inoculated with 105 PFU/mouse of DENV-2 via needle inoculation as previously described. Starting at 48 hours post inoculation, and each day thereafter, mice were anesthetized and placed on top of cartons (1 mouse per carton) containing naïve mosquitoes that had emerged three to four days prior to the beginning of the experiment. Mosquitoes were allowed to feed for approximately twenty minutes and then the mice were removed. Engorged females were separated and placed in clean cartons and kept at constant environmental conditions as described above. Whole mosquito bodies were tested for the presence of virus five days post exposure to determine infection status.
Cytokine measurement and statistical analysis
IFN-γ, (tumor necrosis factor) TNF-α, (interleukin) IL-4 and IL-1β were measured using the Millipore Milliplex MAP Mouse Cytokine/Chemokine kit as per manufacturer’s instructions (Millipore, Billerica, MA).
Viremia and cytokine levels were statistically analyzed using analysis of variance (ANOVA) on a daily basis. Days of detectable viremia were re-centered around the peak viremia day: three days before peak day (P-3), two days before peak day (P-2), the day before (P-1), peak day (P0), the day after peak (P1) and where relevant, two days after peak (P2). In mosquito inoculated mice, day of viremia onset and peak viremia level relative to the number of mosquitoes was analyzed using simple linear regression. All analyses were performed in SAS 9.13 (PROC MIXED, PROC REG, Carey, NC). Significance is reported at the α = 0.05 level.
Recapitulation of the transmission cycle
Three mice were inoculated with 105 PFU/mouse of DENV, serum was collected for virus detection daily, and mosquitoes were allowed to feed as described above. Mosquitoes were then held at constant environmental conditions as described above and at sixteen days post exposure, the three cohorts of mosquitoes exposed to the highest viral titers (determined upon testing of mouse serum) were allowed to re-feed upon naïve mice. Immediately after re-feeding, mosquitoes were frozen, legs removed from bodies and tested for infection and dissemination status as in . These mice were subsequently bled daily and serum was collected and tested for DENV presence and titer.
The authors would like to thank the following people for their support in this research: Julie Woody and the LSU School of Veterinary Medicine Division of Laboratory Animal Medicine. This work was supported by the National Institutes of Health grant NIH/NIGMS P20GM103458. The funding authorities had no role in the design, collection, analyses or interpretation of data.
- WHO: Fact Sheet No. 117: Dengue and severe dengue. 2012.http://www.who.int/mediacentre/factsheets/fs117/en/ [cited December 8, 2012]; Available from:
- Teixeira MG, Costa Mda C, Barreto F, Barreto ML: Dengue: twenty-five years since reemergence in Brazil. Cad Saude Publica 2009,25(Suppl 1):S7-S18.PubMed
- Oki M, Yamamoto T: Climate change, population immunity, and hyperendemicity in the transmission threshold of dengue. PLoS One 2012, 7: e48258. 10.1371/journal.pone.0048258PubMedPubMed CentralView Article
- Andraud M, Hens N, Marais C, Beutels P: Dynamic epidemiological models for dengue transmission: a systematic review of structural approaches. PLoS One 2012, 7: e49085. 10.1371/journal.pone.0049085PubMedPubMed CentralView Article
- Karim MN, Munshi SU, Anwar N, Alam MS: Climatic factors influencing dengue cases in Dhaka city: a model for dengue prediction. Indian J Med Res 2012, 136: 32-39.PubMedPubMed Central
- Were F: The dengue situation in Africa. Paediatr Int Child Health 2012,32(Suppl 1):18-21.PubMedPubMed CentralView Article
- Goncalves D, de Queiroz Prado R, Almeida Xavier E, Cristina de Oliveira N, da Matta Guedes PM, da Silva JS, Moraes Figueiredo LT, Aquino VH: Imunocompetent mice model for dengue virus infection. Scientific World Journal 2012, 2012: 525947.PubMedPubMed CentralView Article
- Liang Z, Wu S, Li Y, He L, Wu M, Jiang L, Feng L, Zhang P, Huang X: Activation of Toll-like receptor 3 impairs the dengue virus serotype 2 replication through induction of IFN-beta in cultured hepatoma cells. PLoS One 2011, 6: e23346. 10.1371/journal.pone.0023346PubMedPubMed CentralView Article
- Perry ST, Buck MD, Lada SM, Schindler C, Shresta S: STAT2 mediates innate immunity to Dengue virus in the absence of STAT1 via the type I interferon receptor. PLoS Pathog 2011, 7: e1001297. 10.1371/journal.ppat.1001297PubMedPubMed CentralView Article
- Nasirudeen AM, Wong HH, Thien P, Xu S, Lam KP, Liu DX: RIG-I, MDA5 and TLR3 synergistically play an important role in restriction of dengue virus infection. PLoS Negl Trop Dis 2011, 5: e926. 10.1371/journal.pntd.0000926PubMedPubMed CentralView Article
- Souza DG, Fagundes CT, Sousa LP, Amaral FA, Souza RS, Souza AL, Kroon EG, Sachs D, Cunha FQ, Bukin E: Essential role of platelet-activating factor receptor in the pathogenesis of Dengue virus infection. Proc Natl Acad Sci USA 2009, 106: 14138-14143. 10.1073/pnas.0906467106PubMedPubMed CentralView Article
- Costa VV, Fagundes CT, Valadao DF, Cisalpino D, Dias AC, Silveira KD, Kangussu LM, Avila TV, Bonfim MR, Bonaventura D: A model of DENV-3 infection that recapitulates severe disease and highlights the importance of IFN-gamma in host resistance to infection. PLoS Negl Trop Dis 2012, 6: e1663. 10.1371/journal.pntd.0001663PubMedPubMed CentralView Article
- Fagundes CT, Costa VV, Cisalpino D, Amaral FA, Souza PR, Souza RS, Ryffel B, Vieira LQ, Silva TA, Atrasheuskaya A: IFN-gamma production depends on IL-12 and IL-18 combined action and mediates host resistance to dengue virus infection in a nitric oxide-dependent manner. PLoS Negl Trop Dis 2011, 5: e1449. 10.1371/journal.pntd.0001449PubMedPubMed CentralView Article
- Katze MG, He Y, Gale M Jr: Viruses and interferon: a fight for supremacy. Nat Rev Immunol 2002, 2: 675-687. 10.1038/nri888PubMedView Article
- Haller O, Kochs G, Weber F: The interferon response circuit: induction and suppression by pathogenic viruses. Virology 2006, 344: 119-130. 10.1016/j.virol.2005.09.024PubMedView Article
- Rodriguez-Madoz JR, Bernal-Rubio D, Kaminski D, Boyd K, Fernandez-Sesma A: Dengue virus inhibits the production of type I interferon in primary human dendritic cells. J Virol 2010, 84: 4845-4850. 10.1128/JVI.02514-09PubMedPubMed CentralView Article
- Shresta S, Kyle JL, Snider HM, Basavapatna M, Beatty PR, Harris E: Interferon-dependent immunity is essential for resistance to primary dengue virus infection in mice, whereas T- and B-cell-dependent immunity are less critical. J Virol 2004, 78: 2701-2710. 10.1128/JVI.78.6.2701-2710.2004PubMedPubMed CentralView Article
- Orozco S, Schmid MA, Parameswaran P, Lachica R, Henn MR, Beatty R, Harris E: Characterization of a model of lethal dengue virus 2 infection in C57BL/6 mice deficient in the alpha/beta interferon receptor. J Gen Virol 2012, 93: 2152-2157. 10.1099/vir.0.045088-0PubMedPubMed CentralView Article
- Jiang D, Weidner JM, Qing M, Pan XB, Guo H, Xu C, Zhang X, Birk A, Chang J, Shi PY: Identification of five interferon-induced cellular proteins that inhibit west nile virus and dengue virus infections. J Virol 2010, 84: 8332-8341. 10.1128/JVI.02199-09PubMedPubMed CentralView Article
- Munoz-Jordan JL: Subversion of interferon by dengue virus. Curr Top Microbiol Immunol 2010, 338: 35-44. 10.1007/978-3-642-02215-9_3PubMed
- Liu P, Woda M, Ennis FA, Libraty DH: Dengue virus infection differentially regulates endothelial barrier function over time through type I interferon effects. J Infect Dis 2009, 200: 191-201. 10.1086/599795PubMedView Article
- Mazzon M, Jones M, Davidson A, Chain B, Jacobs M: Dengue virus NS5 inhibits interferon-alpha signaling by blocking signal transducer and activator of transcription 2 phosphorylation. J Infect Dis 2009, 200: 1261-1270. 10.1086/605847PubMedView Article
- Tan GK, Ng JK, Lim AH, Yeo KP, Angeli V, Alonso S: Subcutaneous infection with non-mouse adapted Dengue virus D2Y98P strain induces systemic vascular leakage in AG129 mice. Ann Acad Med Singapore 2011, 40: 523-532.PubMed
- Stein DA, Huang CY, Silengo S, Amantana A, Crumley S, Blouch RE, Iversen PL, Kinney RM: Treatment of AG129 mice with antisense morpholino oligomers increases survival time following challenge with dengue 2 virus. J Antimicrob Chemother 2008, 62: 555-565. 10.1093/jac/dkn221PubMedView Article
- Tan GK, Ng JK, Trasti SL, Schul W, Yip G, Alonso S: A non mouse-adapted dengue virus strain as a new model of severe dengue infection in AG129 mice. PLoS Negl Trop Dis 2010, 4: e672. 10.1371/journal.pntd.0000672PubMedPubMed CentralView Article
- Zompi S, Santich BH, Beatty PR, Harris E: Protection from secondary dengue virus infection in a mouse model reveals the role of serotype cross-reactive B and T cells. J Immunol 2012, 188: 404-416. 10.4049/jimmunol.1102124PubMedPubMed CentralView Article
- Williams KL, Zompi S, Beatty PR, Harris E: A mouse model for studying dengue virus pathogenesis and immune response. Ann N Y Acad Sci 2009,1171(Suppl 1):E12-E23.PubMedView Article
- Kyle JL, Balsitis SJ, Zhang L, Beatty PR, Harris E: Antibodies play a greater role than immune cells in heterologous protection against secondary dengue virus infection in a mouse model. Virology 2008, 380: 296-303. 10.1016/j.virol.2008.08.008PubMedPubMed CentralView Article
- Kyle JL, Beatty PR, Harris E: Dengue virus infects macrophages and dendritic cells in a mouse model of infection. J Infect Dis 2007, 195: 1808-1817. 10.1086/518007PubMedView Article
- Shresta S, Kyle JL, Robert Beatty P, Harris E: Early activation of natural killer and B cells in response to primary dengue virus infection in A/J mice. Virology 2004, 319: 262-273. 10.1016/j.virol.2003.09.048PubMedView Article
- Yauch LE, Shresta S: Mouse models of dengue virus infection and disease. Antiviral Res 2008, 80: 87-93. 10.1016/j.antiviral.2008.06.010PubMedPubMed CentralView Article
- Balsitis SJ, Williams KL, Lachica R, Flores D, Kyle JL, Mehlhop E, Johnson S, Diamond MS, Beatty PR, Harris E: Lethal antibody enhancement of dengue disease in mice is prevented by Fc modification. PLoS Pathog 2010, 6: e1000790. 10.1371/journal.ppat.1000790PubMedPubMed CentralView Article
- Cassetti MC, Durbin A, Harris E, Rico-Hesse R, Roehrig J, Rothman A, Whitehead S, Natarajan R, Laughlin C: Report of an NIAID workshop on dengue animal models. Vaccine 2010, 28: 4229-4234. 10.1016/j.vaccine.2010.04.045PubMedPubMed CentralView Article
- Mota J, Rico-Hesse R: Humanized mice show clinical signs of dengue fever according to infecting virus genotype. J Virol 2009, 83: 8638-8645. 10.1128/JVI.00581-09PubMedPubMed CentralView Article
- Cox J, Mota J, Sukupolvi-Petty S, Diamond MS, Rico-Hesse R: Mosquito bite delivery of dengue virus enhances immunogenicity and pathogenesis in humanized mice. J Virol 2012, 86: 7637-7649. 10.1128/JVI.00534-12PubMedPubMed CentralView Article
- Daffis S, Suthar MS, Szretter KJ, Gale M Jr, Diamond MS: Induction of IFN-beta and the innate antiviral response in myeloid cells occurs through an IPS-1-dependent signal that does not require IRF-3 and IRF-7. PLoS Pathog 2009, 5: e1000607. 10.1371/journal.ppat.1000607PubMedPubMed CentralView Article
- Honda K, Yanai H, Negishi H, Asagiri M, Sato M, Mizutani T, Shimada N, Ohba Y, Takaoka A, Yoshida N, Taniguchi T: IRF-7 is the master regulator of type-I interferon-dependent immune responses. Nature 2005, 434: 772-777. 10.1038/nature03464PubMedView Article
- Sato M, Suemori H, Hata N, Asagiri M, Ogasawara K, Nakao K, Nakaya T, Katsuki M, Noguchi S, Tanaka N, Taniguchi T: Distinct and essential roles of transcription factors IRF-3 and IRF-7 in response to viruses for IFN-alpha/beta gene induction. Immunity 2000, 13: 539-548. 10.1016/S1074-7613(00)00053-4PubMedView Article
- Shresta S, Sharar KL, Prigozhin DM, Snider HM, Beatty PR, Harris E: Critical roles for both STAT1-dependent and STAT1-independent pathways in the control of primary dengue virus infection in mice. J Immunol 2005, 175: 3946-3954.PubMedView Article
- Shresta S, Sharar KL, Prigozhin DM, Beatty PR, Harris E: Murine model for dengue virus-induced lethal disease with increased vascular permeability. J Virol 2006, 80: 10208-10217. 10.1128/JVI.00062-06PubMedPubMed CentralView Article
- Johnson AJ, Roehrig JT: New mouse model for dengue virus vaccine testing. J Virol 1999, 73: 783-786.PubMedPubMed Central
- Styer LM, Lim PY, Louie KL, Albright RG, Kramer LD, Bernard KA: Mosquito saliva causes enhancement of West Nile virus infection in mice. J Virol 2011, 85: 1517-1527. 10.1128/JVI.01112-10PubMedPubMed CentralView Article
- Thangamani S, Higgs S, Ziegler S, Vanlandingham D, Tesh R, Wikel S: Host immune response to mosquito-transmitted chikungunya virus differs from that elicited by needle inoculated virus. PLoS One 2010, 5: e12137. 10.1371/journal.pone.0012137PubMedPubMed CentralView Article
- Schneider BS, Higgs S: The enhancement of arbovirus transmission and disease by mosquito saliva is associated with modulation of the host immune response. Trans R Soc Trop Med Hyg 2008, 102: 400-408. 10.1016/j.trstmh.2008.01.024PubMedPubMed CentralView Article
- Limesand KH, Higgs S, Pearson LD, Beaty BJ: Potentiation of vesicular stomatitis New Jersey virus infection in mice by mosquito saliva. Parasite Immunol 2000, 22: 461-467. 10.1046/j.1365-3024.2000.00326.xPubMedView Article
- Green S, Vaughn DW, Kalayanarooj S, Nimmannitya S, Suntayakorn S, Nisalak A, Lew R, Innis BL, Kurane I, Rothman AL, Ennis FA: Early immune activation in acute dengue illness is related to development of plasma leakage and disease severity. J Infect Dis 1999, 179: 755-762. 10.1086/314680PubMedView Article
- Chaturvedi UC, Elbishbishi EA, Agarwal R, Raghupathy R, Nagar R, Tandon R, Pacsa AS, Younis OI, Azizieh F: Sequential production of cytokines by dengue virus-infected human peripheral blood leukocyte cultures. J Med Virol 1999, 59: 335-340. 10.1002/(SICI)1096-9071(199911)59:3<335::AID-JMV13>3.0.CO;2-EPubMedView Article
- Chen RF, Yeh WT, Yang MY, Yang KD: A model of the real-time correlation of viral titers with immune reactions in antibody-dependent enhancement of dengue-2 infections. FEMS Immunol Med Microbiol 2001, 30: 1-7. 10.1111/j.1574-695X.2001.tb01542.xPubMedView Article
- Ip PP, Liao F: Resistance to dengue virus infection in mice is potentiated by CXCL10 and is independent of CXCL10-mediated leukocyte recruitment. J Immunol 2010, 184: 5705-5714. 10.4049/jimmunol.0903484PubMedView Article
- Hsieh MF, Lai SL, Chen JP, Sung JM, Lin YL, Wu-Hsieh BA, Gerard C, Luster A, Liao F: Both CXCR3 and CXCL10/IFN-inducible protein 10 are required for resistance to primary infection by dengue virus. J Immunol 2006, 177: 1855-1863.PubMedView Article
- Chen JP, Lu HL, Lai SL, Campanella GS, Sung JM, Lu MY, Wu-Hsieh BA, Lin YL, Lane TE, Luster AD, Liao F: Dengue virus induces expression of CXC chemokine ligand 10/IFN-gamma-inducible protein 10, which competitively inhibits viral binding to cell surface heparan sulfate. J Immunol 2006, 177: 3185-3192.PubMedView Article
- Endy TP, Anderson KB, Nisalak A, Yoon IK, Green S, Rothman AL, Thomas SJ, Jarman RG, Libraty DH, Gibbons RV: Determinants of inapparent and symptomatic dengue infection in a prospective study of primary school children in Kamphaeng Phet. Thailand. PLoS Negl Trop Dis 2011, 5: e975. 10.1371/journal.pntd.0000975PubMedView Article
- Endy TP, Chunsuttiwat S, Nisalak A, Libraty DH, Green S, Rothman AL, Vaughn DW, Ennis FA: Epidemiology of inapparent and symptomatic acute dengue virus infection: a prospective study of primary school children in Kamphaeng Phet, Thailand. Am J Epidemiol 2002, 156: 40-51. 10.1093/aje/kwf005PubMedView Article
- Styer LM, Kent KA, Albright RG, Bennett CJ, Kramer LD, Bernard KA: Mosquitoes inoculate high doses of West Nile virus as they probe and feed on live hosts. PLoS Pathog 2007, 3: 1262-1270.PubMedView Article
- Christofferson RC, Mores CN: Estimating the magnitude and direction of altered arbovirus transmission due to viral phenotype. PLoS One 2011, 6: e16298. 10.1371/journal.pone.0016298PubMedPubMed CentralView Article
- Golde WT, Gollobin P, Rodriguez LL: A rapid, simple, and humane method for submandibular bleeding of mice using a lancet. Lab Anim (NY) 2005, 34: 39-43.View Article
- Chisenhall DM, Vitek CJ, Richards SL, Mores CN: A method to increase efficiency in testing pooled field-collected mosquitoes. J Am Mosq Control Assoc 2008, 24: 311-314. 10.2987/5671.1PubMedView Article
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