Use and limit of sero-diagnosis on calf pneumonia associated with Mycoplasmatales.

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  • マイコプラズマの関与する子牛肺炎の血清学的診断の応用と限度について
  • マイコプラズマの関与する子牛肺炎の血清学的診断の応用と限度について〔英文〕
  • マイコプラズマ ノ カンヨスル コウシ ハイエン ノ ケッセイガクテキ シンダ

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Abstract

The latex agglutination (LA) test was performed with antigens of Mycoplasma bovis 22-1 and M. bovirhinis BP19 to detect agglutinin from calf sera by using a microtiter technique. For the detection of antibody against Ureaplasma strains 96T and 5V, the metabolism inhibition (MI) test was carried out. Of 66 neonatal calves, six exhibited a low LA serum antibody titer (1:8) against BP19, but had no antibody to the other strains. It was suggested that maternal immunity to these organisms might be absent in calves. Thirty-three neonatal calves introduced into two farms exhibited a rapid rise in antibody titer against either of the 4 strains used. Both tests were conducted with 38 paired sera from calves affected with respiratory diseases. They revealed that some acute phase sera contained antibody against these strains, although a rise in titer of convalescent sera was not necessarily significant. In contrast to the sera from the neonatal calves, a significant antibody titer against ureaplasmas and M. bovirhinis was demonstrated among 260 sera from calves affected with respiratory diseases on 21 farms. These results suggest that the incidence of herd-infection with ureaplasmas and mycoplasmas may be unexpectedly high. Practical application and limit of the serodiagnosis of mycoplasmal calf pneumonia were discussed.

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