Using indirect hemagglutination test,a serological determination for chlamydia infection on dairy cattle,farm cattle buffalo as well as sows with dead born and abortion history from 10 cattle farms and 7 pig farms in Hunan province was carried Out.out of 410 serum samples from 7 dairy cattle farms 33 (8.05％)are serologieally positive and 37(9.12％)suspect.Out of 123 serum samples of buffalos and farm cattle from the othe 3 farms only one (0.80％)is serologically suspectable and all the others are negative.Out of Ⅲ serum samples taken from sow...
