| Analysis of Mycoptasma hyopneumoniae infection byseroepidemiological investigation in Korean swine herds |
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Hye-kwon Kim1, Eun-mi Kim1, Hyoung-joon Moon1, Tae-yung Kim1, Jong-sung Lim2, Yang-ho Lee2, Bong-kyun Park1 |
1College of Veterinary Medicine, Seoul National University
2Merial Korea Ltd. |
| 혈청학석조사를 통한 한국 양돈장에서의Mycoplasma hyopneumonae 감염 시점의 분석 |
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김혜권1, 김은미1, 문형준1, 김태융1, 임종성2, 이양호2, 박봉균1 |
1서울대학교 수의과대학
2메리알 코리아 (주) |
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| Abstract |
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Blood samples from 622 pigs of 44 farms which were sero-positive to Mycoplasma hyopneumoniae (M. hyo) by ELISA method were collected from May 2003 to July 2004. And they were divided into 2 categories : M. hyo-vaccinated group (7 swine farms) and M. hyo-non-vaccinated group (37 swine farms). Then, each swine farm was analysed by sero-positive percentage per weeks of age. It was observed that the sero-positive percentage to M. hyo is directly proportional to weeks of age in the 44 swine farms that were selected. This meant that there has been a chronic infection of M. hyo in Korean swine herds and control of M. hyo infection did not have worked efficiently. In 7 M. hyo-vaccinated swine farms, there were no reliable patterns between sero-positive percentage to M. hyo and weeks of age. Although the swine farms have been used M. hyo vaccine, they had only little sero-positive percentage that was less than 50% at 6 to 11 weeks of age. This means a present vaccination program does not induce sufficiently a seroconversion expected. In 37 M. hyo-non-vaccinated swine farms, it was observed that sero-positive percentage was higher at above 15 weeks of age. This result showed that infection of M. hyo occurred commonly at between 7 and 12 weeks of age, at which pigs moved to the growing house. Because a risk of natural infection is severe at growing stage as well as nursery stage, it suggested that M. hyo vaccination at several weeks prior to the growing stage will give efficient effect to control the enzootic pneumonia. |
| Key Words:
Mvcoplasnia hyopnenmoniae, Seroepideimologv, ELISA, Korean swiiie herd |
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