Nº of responding pigs; mean titre (log2 ) and standard deviation Range of titres (log2 ) for positive pigs | ||||||||
---|---|---|---|---|---|---|---|---|
Strain used in the viral neutralization test | ||||||||
3262 | 3267 | |||||||
Days post-inoculation | Days post-inoculation | |||||||
Challenge group† | 21 | 42 | 84 | 98 | 21 | 42 | 84 | 98 |
A + A | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 3/4* | 4/4* | 4/4* |
(3262+3262) | - | - | - | - | - | 1.7 ± 0.6a | 2.0 ± 0.8a | 4.25 ± 1.0b |
(1–2) | (1–3) | (3–5) | ||||||
A + B | 0/4 | 0/4 | 0/4 | 0/4 | 0/4 | 2/4 | 2/4 | 4/4* |
(3262+3267) | - | - | - | - | - | 1.0 ± 0.0a | 2.0 ± 0.0a | 5.3 ± 0.5b |
(1–1) | (2–2) | (5–6) | ||||||
C1 + B | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 0/2 | 2/2* |
(C+3267) | - | - | - | - | - | - | - | 2.5 ± 0.5 |
(2–3) | ||||||||
B + B | 0/4 | 2/4 | 4/4‡ | 4/4‡ | 4/4‡ | 4/4 | 4/4 | 4/4 |
(3267+3267) | 0/4 | 1.0 ± 0.0 | 2.2 ± 1.5 | 2.8 ± 1.7 | 2.0 ± 0.8a | 2.5 ± 1.0a | 4.8 ± 1.0b | 6.0 ± 0.8b¶ |
- | (1–1) | (1–4) | (1–5) | (1–3) | (2–4) | (4–6) | (5–7) | |
B + A | 0/3 | 0/3 | 3/3‡ | 3/3‡ | 1/3 | 3/3 | 3/3 | 3/3 |
(3267+3262) | 2.0 ± 1.0 | 1.3 ± 0.6 | 1.0 ± 0.0 | 3.0 ± 1.0a | 4.0 ± 1.0a | 5.3 ± 0.6b | ||
- | - | (1–3) | (1–2) | (1–1) | (2–4) | (3–5) | (5–6) | |
C2 + A | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 | 0/3 |
(C+3262) | - | - | - | - | - | - | - | - |