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  • Title: Serological monitoring on layer farms with specific pathogen-free chickens.
    Author: Takase K, Murakawa Y, Ariyoshi R, Eriguchi S, Sugimura T, Fujikawa H.
    Journal: J Vet Med Sci; 2000 Dec; 62(12):1327-9. PubMed ID: 11193353.
    Abstract:
    To monitor the existence of avian pathogens in laying chicken flocks, specific pathogen-free (SPF) chickens were introduced into two layer farms and reared with laying hens for 12 months. SPF chickens were bled several times after their introduction and examined for their sero-conversion to avian pathogens. As a result, antibodies to eight or ten kinds of pathogens were detected in SPF chickens on each farm. Antibodies to infectious bronchitis virus (IBV), avian nephritis virus, Mycoplasma gallisepticum and M. synoviae were detected early within the first month. Antibody titer to IBV suggested that the laying chickens were infected with IBV repeatedly during the experiment on both farms. However, antibodies to infectious bursal disease virus and 6 pathogens were not detected.
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