Table 4.

Virus titers in nasal swabs at 1 to 5 days post infection (dpi) and bronchoalveolar lavage fluid (BALF) at 5 dpi from pigs with maternally-derived antibodies (MDA) from sows vaccinated with H1N2-δ1(1:7) WIV or without MDA and challenged with homologous H1N2-δ1(1:7) or heterologous H1N1pdm09(2:6) in Study 1. Values shown as mean ± standard error of the mean (SEM).

Challenge Groups	Nasal swabs^x					BALF^x

	1 dpi	2 dpi	3 dpi	4 dpi	5 dpi	5 dpi
No MDA/NC	0.0 ± 0.0^a	0.0 ± 0.0^a	0.0 ± 0.0^a	0.0 ± 0.0^a	0.0 ± 0.0^a	0.0 ± 0.0^a
Homologous
No MDA/H1N2	1.5 ± 0.4^b	1.9 ± 0.4^b	2.3 ± 0.4^b	2.8 ± 0.3^b	2.8 ± 0.2^b	3.9 ± 0.5^b
WIV-MDA/H1N2	0.0 ± 0.0^a	0.1 ± 0.1^a	0.8 ± 0.4^a	0.8 ± 0.4^a	0.1 ± 0.1^a	2.7 ± 0.7^b
Heterologous
No MDA/H1N1	1.2 ± 0.2^b	1.0 ± 0.1^b	1.0 ± 01^a^,^b	1.5 ± 0.2^b	1.0 ± 0.2^b	0.7 ± 0.4^a
WIV-MDA/H1N1	1.3 ± 0.3^b	0.5 ± 02^a^,^b	1.4 ± 0.2^b	1.2 ± 0.2^b	1.0 ± 0.2^b	1.3 ± 0.4^a

Virus titers represented as log10 TCID₅0/ml.

^a,b,c

Statistically significant differences in the same column identified with different lowercase letters (P ≤ 0.05).