Table 1.

Number of positive nasal and saliva swabs out of those tested for the matrix (M) gene of influenza A viruses and for the specific H1pdm gene. All samples were analyzed for the M gene whereas only M gene-positive samples were also tested for H1pdm.

*Three piglets were positive at both swab types. **Saliva swabs did not provide enough fluid for analysis. §half of the piglets were asymptomatic. #Samples were analyzed only in pools; 16 pools correspond to 120 individual swabs, 60 of which originated from asymptomatic piglets.

		M gene (positive/total samples)	M gene (positive/total samples)	H1N1pdm HA gene (positive/total samples)	H1N1pdm HA gene (positive/total samples)
Sampling phase	Sampling date	Nasal swabs	Saliva swabs	Nasal swabs	Saliva swabs
Pre-intervention	18/11/2013	10/75 (13.3%)	11/22 (50%)	3/75 (4%)	5/22 (22.7%)
Post-intervention	27/12/2013	6/13 (46.2%)	8/13 (61.5%)	1/13 (7.7%)	1/13 (7.7%)
	8/1/2014	6/20 (30%)	2/18** (11.1%)	0/20 (0%)	0/18 (0%)
	15/01/2014	2/11(18.2%)	0/9** (0%)	0/11 (0%)	0/9 (0%)
	28/01/2014	5/15 (33.3%)	5/12** (41.7%)	0/15 (0%)	0/12 (0%)
	18/02/2014	0/10 (0%)	2/5 (40%)	0/10 (0%)	0/5 (0%)
	1/4/2014	8/60§ (13.3%)	1/44§** (2.3%)	0/60 (0%)	0/44 (0%)
	26/06/2014	5/16# (31.2%)	8/16# (50%)	0/16# (0%)	0/16# (0%)