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Table 1 Serology of chickens challenged with velogenic NDV strain Herts following vaccination with live-attenuated NDV vaccine

From: Engineered recombinant protein products of the avian paramyxovirus type-1 nucleocapsid and phosphoprotein genes for serological diagnosis

DPC Group Serological assays
Commercial
NDV iELISA
HI iELISA-NPct iELISA-Pu iELISA-Vu
0 DPC vaccinated 8/101 8/10 9/10 9/10 2/10
control 0/6 0/6 0/6 0/6 0/6
3 DPC vaccinated 9/10 9/10 9/10 7/10 2/10
control 0/6 0/6 0/6 0/6 0/6
7 DPC vaccinated 10/10 10/10 10/10 8/10 7/10
control 4/4 4/4 4/4 2/4 2/4
14 DPC vaccinated 10/10 10/10 10/10 8/10 7/10
control 4/4 4/4 4/4 4/4 4/4
21 DPC vaccinated 9/9 8/9 9/9 8/9 7/9
control 4/4 4/4 4/4 4/4 4/4
28 DPC vaccinated 6/6 5/6 6/6 4/6 4/6
control 4/4 4/4 4/4 4/4 2/4
  1. Vaccinated group – Ten chickens each were vaccinated with NDV strain “Clone 30”
  2. Control group – Six chickens did not receive vaccination before challenge
  3. DPC – days postchallenge; challenge infection with NDV strain Herts33 was carried out on day 21 post vaccination, i.e. day 0 DPC characterizes the status at day 21 post vaccination
  4. HI – hemagglutination inhibition assay against NDV LaSota antigen
  5. 1N/M – numbers of seropositive/total chickens