Duration of maternally derived antibodies against equine influenza in newborn foals.
Serum antibody concentrations against influenza A-equi-1 virus and A-equi-2 virus were measured in a group of 18 foals from birth to 4 months of age. More than 50% of the foals were seronegative to A-equi-1 virus infection by 4 weeks of age, with titers of less than or equal to 1:16. For A-equi-2 virus, more than 50% of the foals were seronegative by 2 weeks of age, with titers of less than or equal to 1:8. Passively derived antibodies against influenza A-equi-1 virus and A-equi-2 virus in foals obtained from recently vaccinated mares and from mares not vaccinated within 6 months before foaling were low in titer. The duration of passively derived antibodies was also short-lived.
D000818:Animals; D000831:Animals, Newborn / Q000276:immunology; D000914:Antibodies, Viral / Q000032:analysis*; D005260:Female; D006734:Horse Diseases / Q000097:blood / Q000276:immunology*; D006736:Horses / Q000276:immunology; D007112:Immunity, Maternally-Acquired; D008297:Male; D009976:Orthomyxoviridae Infections / Q000097:blood / Q000276:immunology / Q000662:veterinary*
D000914:Antibodies, Viral