Swine influenza virus infection in different age groups of pigs in farrow-to-finish farms in Thailand

Table 3 Number of seropositive pigs H1 swine influenza viruses by commercial H1N1 Swine influenza virus ELISA test and HI test in different farms and different age group

Farm	Group	Jun.-Jul. 2008						Oct.-Nov. 2008						Jan. 2009						Jul. 2009						Nov. 2009
		ELISA^a	HI^b				n ^c	ELISA	HI				n	ELISA	HI				n	ELISA	HI				n	ELISA	HI				n
			Cla	Clb	lowa	Pdm			Cla	Clb	lowa	Pdm			Cla	Clb	lowa	Pdm			Cla	Clb	lowa	Pdm			Cla	Clb	lowa	Pdm
B	Sow	6	9	10	7	0	10	3	2	1	1	0	10	3	2	3	1	0	10	7	1	3	3	1	10	6	3	6	2	3	10
	Fattening pig	- ^d						3	2	4	0	0	10	1	0	0	0	0	10	6	2	4	0	0	10	0	0	0	0	0	10
	Weaned pig	4	1	2	1	0	20	4	3	1	0	0	10	2	3	0	0	0	10 ^e	2	0	0	0	0	10	0	0	0	0	0	10 ^e
	Introduced pig	-						-						-						0	0	0	0	0	10	0	0	0	0	0	10
C	Sow	8	6	6	4	3	10	9	8	6	6	5	10	9	7	7	5	1	10	7	4	3	4	1	10	10	9	9	9	6	10
	Fattening pig	1	1	0	0	0	10	2	1	0	0	0	10	5	2	0	0	0	10	7	0	2	0	0	10	1	0	0	0	0	10
	Weaned pig	1	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10
	Introduced pig	-						-						-						5	2	0	1	0	10	8	4	6	6	2	11
D	Sow	-						0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10	10	10	9	6	10	10
	Fattening pig							0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10	2	2	1	2	8	10
	Weaned pig							0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	1	10 ^e
E	Sow	2	1	1	1	1	10	1	1	0	0	1	10	4	4	5	5	3	8	-						-
	Fattening pig	0	0	0	0	0	10	0	0	0	0	0	10	3	9	9	3	0	10
	Weaned pig	0	0	0	0	0	10	0	0	0	0	0	10	0	4	8	4	0	10
	Introduced pig	-						-						0	0	0	0	0	3
F	Sow	-						0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	9	-
	Fattening pig							0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10
	Weaned pig							0	0	0	0	0	10	0	0	0	0	0	10	0	0	0	0	0	10

^aSample to positive (S/P) ratios were calculated using the optical density (OD) of each sample, positive control and negative control. The S/P ratios greater than 0.40 were considered as positive for antibodies againts H1N1 SlVs
^bSamples showing HI activity at 1:40 or higher were considered as positve againts antigens A/swine/Ratchaburi/NIAH550/2003(H1N1)(Cla), A/swine/Ratchaburi/NIAH101942/2008(H1N1)(Clb), A/swine/lowal/15/1930 (H1N1)(lowa) and A/swine/Saraburi/NIAH112226-24/2009 (H1N1pdm)(Pdm)
^cNumber of serums collected
^dSamples were not collected
^eThe groups from which H1N1 SIVs were isolated

ISSN: 1743-422X