TABLE 1.
Age when maternally immunized calves became seronegative to BHV-1a by three serological tests and BHV-1 neutralizing antibody half-lives
| Groupb | Mean age in weeks ± SD
|
Antibody half-life in days | ||
|---|---|---|---|---|
| Indirect ELISA | gE blocking ELISA | VN test | ||
| C | 30 ± 9 (n = 7) | 21 ± 6 (n = 7) | 24 ± 6 (n = 7) | 30 ± 6 (n = 7) |
| CV | 31 ± 2 (n = 4) | 22 ± 4 (n = 6) | 27 ± 5 (n = 4) | 32 ± 8 (n = 5)c |
a
Calves of group CV were inoculated with a live-attenuated vaccine strain at 4 days of age; therefore, the p.i. time for each animal can be considered as its age.
b
Group C, not vaccinated; group CV, vaccinated.
c
Antibody half-lives were calculated on the five calves which did not show any increase in antibody titers after inoculation.