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Table 2 Genotyping of Pepino mosaic virus isolates with reverse transcription loop-mediated isothermal amplification (RT-LAMP) and its validation with genotype-specific RT-PCR

From: Pepino mosaic virus genotype shift in North America and development of a loop-mediated isothermal amplification for rapid genotype identification

Country of origin

Isolate name

ELISAa

EU

US1

CH2

RT-PCR/RT-LAMP

RT-PCR/RT-LAMP

RT-PCR/RT-LAMP

USA

VFTX12-01

(++++)

(−)/(+)b

−/−

+/+

VFTX12-02

(++++)

(−)/(+)b

−/−

+/+

VFTX12-03

(++++)

(−)/(+)b

−/−

+/+

VFTX12-04

(++++)

−/−

−/−

+/+

VFTX12-05

(++++)

+/+

−/−

+/+

VFTX12-06

(++++)

+/+

−/−

+/+

VFTX12-07

(++++)

+/+

−/−

+/+

VFTX12-08

(++++)

+/+

−/−

+/+

VFTX12-09

(+++)

+/+

−/−

+/+

VFTX12-10

(++++)

+/+

−/−

+/+

VFTX12-11

(++++)

−/−

−/−

+/+

VFTX12-12

(++++)

−/−

−/−

+/+

VFTX12-13

(+++)

+/+

−/−

+/+

VFTX12-14

(+++)

+/+

−/−

+/+

VFTX12-15

(+++)

+/+

−/−

+/+

VFTX12-16

(+++)

−/−

−/−

+/+

VFTX12-18

(+++)

−/−

−/−

+/+

VFTX12-19

(+++)

−/−

−/−

+/+

VFTX12-20

(+++)

−/−

−/−

+/+

VFTX12-21

(+)

+/+

−/−

+/+

VFTX12-22

(+++)

−/−

−/−

+/+

VFTX12-23

(+)

−/−

−/−

+/+

VFTX12-24

(+++)

−/−

−/−

+/+

VFTX12-25

(+++)

−/−

−/−

+/+

Mexico

BNMX12-01

(+++)

−/−

+/+

−/−

BNMX12-02

(+++)

−/−

+/+

−/−

BNMX12-03

(+++)

−/−

+/+

−/−

BNMX12-04

(+++)

−/−

+/+

−/−

BNMX12-05

(+++)

−/−

+/+

−/−

BNMX12-06

(+++)

−/−

+/+

−/−

BNMX12-07

(+++)

−/−

+/+

−/−

BNMX12-08

(+++)

−/−

+/+

−/−

BNMX12-09

(+++)

−/−

+/+

−/−

BNMX12-10

(+++)

−/−

+/+

−/−

BNMX12-11

(+++)

−/−

+/+

−/−

BNMX12-12

(+++)

−/−

+/+

−/−

BNMX12-13

(+++)

−/−

+/+

+/+

BNMX12-14

(+++)

−/−

+/+

−/−

BNMX12-15

(++)

−/−

+/+

−/−

BNMX12-16

(++)

−/−

+/+

+/+

Canada

VFBC12-01

(+++)

−/−

(−)/(+)b

+/+

VFBC12-02

(++++)

−/−

(−)/(+)b

+/+

VFBC12-03

(+++)

−/−

(−)/(+)b

+/+

VFBC12-04

(−)

−/−

−/−

+/+

VFBC12-05

(+++)

−/−

−/−

+/+

VFBC12-06

(++)

−/−

−/−

+/+

VFBC12-07

(+)

−/−

−/−

+/+

VFBC12-08

(++++)

−/−

−/−

+/+

VFBC12-09

(+)

−/−

−/−

+/+

VFBC12-10

(+++)

−/−

−/−

(+)/+c

Positive

 

(+++)

+/+

+/+

+/+

Negative

 

(−)

−/−

−/−

−/−

  1. a ELISA ratings: (−) <0.100; (+): 0.101-0.500; (++): 0.501-1.000; (+++): 1.001-2.000; (++++) >2.001.
  2. b A discrepancy was observed in these isolates with a negative (−) RT-PCR, but a positive (+) RT-LAMP. A confirmation test through sequencing of cloned RT-LAMP products was performed to determine the authenticity of their viral origin.
  3. c The result for a positive (+) RT-PCR was not consistent from one experiment to another while RT-LAMP was consistently positive.