Serological observations on Chlamydia psittaci infection in Finnish dairy herds
Neuvonen, E.; Pyörälä, E.
Acta Veterinaria Scandinavica 22(1): 1-8
1981
ISSN/ISBN: 0044-605X PMID: 7258022 Document Number: 175401
Chlamydial complement fixing antibodies were followed in 5 small Finnish dairy herds. All 53 animals in the herds were bled. In herds A, B, C and D the blood samples were collected in May and in the following autumn after the pasturing period and in herd E over a period of 2 yr at about 1 1/2-mo. intervals. The frequencies of positive reactions among the adults and the calves younger than 1 yr did not differ significantly from each other, but there were considerable seasonal variations in the frequencies. The highest frequency was found during springtime and early summer and the lowest in autumn.