Yan  Sun, Lu  Lin, Zhongqiong  Chen, Lian  Wu, ZhongLiang  Xiong, XiaoMing  Li, 
    Serology Study of <I>Mycoplasma gallisepticum</I> in Broiler Chickens in 
  Chongqing,
    Journal of Animal and Veterinary Advances,
    Volume 13,Issue 1,
    2014,
    Pages 5-8,
    ISSN 1680-5593,
    javaa.2014.5.8,
    (https://makhillpublications.co/view-article.php?doi=javaa.2014.5.8)
    Abstract: <I>Mycoplasma gallisepticum</I> (MG) is a bacterium that causes 
  Chronic Respiratory Disease (CRD) a highly contagious disease that affects the 
  respiratory system of the chicken leading to reduced egg production. In chickens, 
  infection may be inapparent or result in varying degrees of respiratory distress 
  with slight to marked rales, difficulty breathing, coughing and/or sneezing. 
  Morbidity is high and mortality low in uncomplicated cases. The aim of this 
  study was to determine the prevalence of <I>Mycoplasma gallisepticum</I> infection 
  among chickens residing on chicken farms in Chongqing. To achieve this aim, 
  field visits were made to chicken farms in WanZhou, ChangShou, HeChuan, JiangJing, 
  QianJiang and WuLong. A total of 22 farms were investigated. A total of 1789 
  sera samples were tested using a commercial ELISA kit. The overall rate of antibody 
  against <I>Mycoplasma gallisepticum</I> prevalnece was 62.62% (568/907) in 2012 
  and 72.45% (639/882) in 2013. The prevalence rates among broiler chickens from 
  parental breeders, backyard farms and chicken farms were 50.28, 68.51 and 17.5%, 
  respectively in 2012 and 57.89, 78.14 and 20%, respectively in 2013. When the 
  data were evaluated according to season, the seroprevalence rates was 59.08% 
  in the Spring and 65.89% in the Fall in 2012 and 68.96 and 75.65% in 2013. Seroprevalence 
  rates of the anti-<I>Mycoplasma gallisepticum</I> in 2012 and 2013 varied significantly 
  according to the breeding patterns of the animals (p&lt;0.001). These results 
  demonstrated that <I>M. gallisepticum</I> was widely distributed in chicken 
  in Chongqing region and high stocking density and low air temperature may leading 
  to a even more higher infection of <I>M. gallisepticum</I>.
    Keywords: Broiler chickens;Mycoplasma gallisepticum;serology;animals;Chongqing