Virus interference between H7N2 low pathogenic avian influenza virus and lentogenic Newcastle disease virus in experimental co-infections in chickens and turkeys

Table 3 Number of turkeys positive for l NDV and LPAIV in oropharyngeal (OP) and cloacal (CL) swabs in single and co-infected groups

Virus detected	Swab	Group		Days post inoculation
Virus detected	Swab	Day 0	Day 3	1	2	3	4	6	8	10	Total^b
l NDV	OP	l NDV		10/10 ^a	10/10	10/10	10/10	4/10	5/10	3/10	52
		LPAIV		ND	ND	ND	ND	ND	ND	ND	-
		l NDV + LPAIV		10/10	10/10	8/10	10/10	0/10	3/10	5/10	46
		LPAIV	l NDV	8/10	7/10	1/10***	2/10***	10/10	10/10*	6/10	44
	CL	l NDV		1/10	0/10	0/10	1/10	0/10	0/10	0/10	2
		LPAIV		ND	ND	ND	ND	ND	ND	ND	-
		l NDV + LPAIV		3/10	2/10	2/10	2/10	1/10	0/10	0/10	10
		LPAIV	l NDV	3/10	1/10	0/10	0/10	3/10	3/10	0/10	10
LPAIV	OP	l NDV		ND	ND	ND	ND	ND	ND	ND	-
		LPAIV		10/10	10/10	10/10	10/10	10/10	10/10	10/10	70
		l NDV + LPAIV		10/10	10/10	10/10	10/10	10/10	10/10	10/10	70
		l NDV	LPAIV	10/10	10/10	10/10	10/10	10/10	9/9	9/9	68
	CL	l NDV		ND	ND	ND	ND	ND	ND	ND	-
		LPAIV		10/10	10/10	10/10	10/10	10/10	10/10	10/10	70
		l NDV + LPAIV		9/10	10/10	9/10	10/10	9/10	10/10	9/10	66
		l NDV	LPAIV	5/10*	9/10	7/10	10/10	10/10	9/9	9/9	59

In groups sequentially infected, the day post-inoculation (dpi) is based on the last virus given.
^aNumber of positive birds/total number of birds sampled at each time point.
^bTotal number of positive swabs.
ND, No data.
*Significant difference for number of positive turkeys by qRT-PCR compared to single virus infected groups, (*, P < 0.05; *** P < 0.001).

ISSN: 1297-9716