Evaluation of porcine reproductive and respiratory syndrome stabilization protocols in 23 French Farrow-to-finish farms located in a high-density swine area

Table 2 Laboratory and clinical results

Farm	Due-to-wean piglets (21 or 28 days of age)		Gilts	Biosecurity	Suggestive clinical signs
Farm	PCR positive results	Strain typing (homologous percentage in ORF7 or ORF5)	Positive serological/virological results during follow-up	Adherence to recommendations	Reproductive disorders, respiratory issues, high losses, and/or coinfections
1	No	Not tested^a	No	Yes	None^c
2	No	Not tested^a	No	Yes	None^c
3	No	Not tested^a	No	Yes	None^c
4	No	Not tested^a	Yes/No	Yes	None^c
5	Yes	Wild strain (ORF5 96%)	Not tested^b	No	Yes
6	No	Not tested^a	No	Yes	None^c
7	No	Not tested^a	Yes/No	Yes	None^c
8	No	Not tested^a	No	Yes	None^c
9	No	Not tested^a	No	Yes	None^c
10	No	Not tested^a	Yes/No	Yes	None^c
11	No	Not tested^a	No	Yes	None^c
12	No	Not tested^a	No	Yes	None^c
13	Yes	Vaccine strain (ORF7 100%)	No	Yes	None^c
14	Yes	Wild strain (ORF7 96%)	Not tested^b	Partially	None^c
15	No	Not tested^a	No	Yes	None^c
16	No	Not tested^a	Yes/No	Yes	None^c
17	No	Not tested^a	No	Yes	None^c
18	Yes	Wild strain (ORF7 95.09%)	Not tested^b	Partially	None^c
19	No	Not tested^a	No	Yes	None^c
20	No	Not tested^a	No	Yes	None^c
21	No	Not tested^a	No	Yes	None^c
22	No	Not tested^a	No	Yes	None^c
23	Yes	Wild strain (ORF5 88%)	Not tested^b	Partially	None^c

^aPCR results being negative, no sequencing could be performed
^bIf a wild strain had been identified in piglets at weaning, monitoring of sentinel gilts was cancelled
^cClinical assessment was performed at every sampling time

ISSN: 2055-5660