Table 2.

Immune protection against NDV isolated in 2012–2014

Virus for challenge	Group	HI titer (log2)	Clinical signs/total	Deaths/total	Positive swabs/total	Positive swabs viral loading (EID50/0.1 mL)	Protection rate (%)a
NDV-HB12	A	7.7	0/10	0/10	1/10b	<10-1.00	90
	D	0.0	5/5	5/5	5/5	10-3.01	0
NDV-SD13	B	7.3	0/10	0/10	0/10	ND	100
	E	0.0	5/5	5/5	5/5	10-3.52	0
NDV-HB14	C	7.5	0/10	0/10	1/10	10-1.07	90
	F	0.0	5/5	5/5	5/5	10-3.64	0
-	M	0.0	0/5	0/5	0/5b,c	ND	100

ND no data

^aProtection definition: means survival without signs of clinical disease not shedding

^bCloaca swab

^cThroat swab