Table 2.
Detection rate (number of positive/total number of samples tested) of anti-porcine epidemic diarrhea virus (PEDV) IgG antibodies in serum samples from farms classified as positive or negative for porcine epidemic diarrhea virus (PEDV), transmissible gastroenteritis virus (TGEV) and porcine respiratory coronavirus (PRCV), as determined using the S1 ELISA.
| Number of farms | Number of samples | Farm infection statusa | Number of S1 ELISA positives (average OD values ± SD) | ||
|---|---|---|---|---|---|
| PEDV | TGEV | PRCV | |||
| 7 | 60 | − | − | − | 0 (0.09 ± 0.04) |
| 2 | 25 | − | − | + | 0 (0.08 ± 0.05) |
| 1 | 20 | − | + | − | 0 (0.08 ± 0.04) |
| 4 | 40 | − | + | + | 0 (0.08 ± 0.04) |
| 3 | 42 | + | − | − | 42 (0.77 ± 0.20) |
| 2 | 52 | + | − | + | 52 (0.71 ± 0.24) |
OD, optical density; SD, standard deviation.
a
Farm infection status determined by at least 50% IgG antibodies positive samples in each farm by immunofluorescence assay (PEDV) or a commercial ELISA (TGEV and PRCV).