Table 1

Seroprevalence in vaccinated and control groups at birth (first day of life), at weaning (21 days of age) and at nursery (49 days of age)

Seropositives % (95% CI)
BirthWeaningNursery
Control group89.1 (85.1-93.1)12.0 (9.0-15.0)2.0 (0-6.0)
Vaccinated group82.2 (78.2-86.2)3.7 (0-8.7)0