Detection of Serum Antibody Against Hog Cholera in Pigs
CHEN Xi zhao,YE Chun yan,JIANG Jin,WANG Chuan bin,WANG Hong wei (National Veterinary Diagnostic Center, China Ministry of Agriculture, Beijing 100094)
The serum samples from 9 intensive pig farms were tested for antibody against hog cholera. Among the 207 serum samples, 0%, 4.8%, and 19.7% checked sera from 7 day old, 20 day old, and 40 day old piglets had antibody titer less than 116 which was regarded as threshold of protective level. The percentage of sera with antibody titer 1∶128 or more were 87.8%, 74.6%, and 35.2% for 7 day old, 20 day old, and 40 day old piglets respectively. After immunizing newborn piglets without sucking, there were 18.4% , 8.4%, 9.8 %, 10.0%, and 15.4% sera from 20 day old, 30 day old, 40 day old, 50 day old, and 60 day old piglets respectively with antibody below the threshold of protective level. The percentage of sera with antibody titer 1128 or more decreased from 41.4% for 40 day old piglets to 15.0% for 50 day old piglets, and 3.8% for 60 day old piglets respectively. In measuring maternal antibody of piglet, all 398 sera from 25 day old piglets had antibody titer above 1∶16, but the percentage of sera with antibody titer 1∶128 or more decreased from 92.8% for 20 day old piglets to 62.5% for 25 day old piglets.
【CateGory Index】： S858.28