Oropharyngeal swab sampling for PRRSV detection in large-scale pig farms: a convenient and reliable method for mass sampling

Table 1 PRRSV detection results in different types of samples from challenged pigs

Sample type	Proportion of positive samples at the indicated days post-challenge
Sample type	0	2	3	4	5	6	7	8	10	12	14	16	18	20	22	24	26	28
OSs	0/6	6/6	6/6	6/6	6/6	6/6	6/6	6/6	6/6	6/6	6/6	6/6	5/6	6/6	6/6	6/6	5/5	5/5
NSs	0/6	1/6	4/6	4/6	6/6	6/6	4/6	5/6	1/6	0/6	0/6	2/6	0/6	1/6	2/6	1/6	0/5	0/5
RSs	0/6	2/6	6/6	6/6	3/6	4/6	4/6	5/6	2/6	4/6	2/6	2/6	1/6	1/6	3/6	1/6	0/5	0/5
OFs	0/6	4/6	6/6	5/6	5/6	4/6	4/6	6/6	5/6	4/6	3/6	3/6	2/6	3/6	2/6	2/6	0/5	0/5
Serum	0/6	6/6	–	–	–	–	6/6	–	–	–	6/6	–	–	6/6	–	–	–	0/5

All samples were collected for the first time at 0 DPC. OS, NS, RS and OFs were collected once daily at 2–8 DPC and every other day at 10–28 DPC. Serum samples were collected at 2, 7, 14, 20, 28 DPC
DPC days post-challenge; OSs oropharyngeal swabs; NSs nasal swabs; RSs rectal swabs; OFs oral fluid swabs

ISSN: 2055-5660