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Direct complement fixation test with avian infectious bronchitis virus in chickens

Published online by Cambridge University Press:  15 May 2009

P. K. Uppal
P. K. Uppal
Affiliation:
Department of Animal Pathology, University of Cambridge, Cambridge
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The direct complement fixation test was performed to follow the antibody response in chickens infected with avian infectious bronchitis virus. Concentrated allantoic fluid (4 units) was used as an antigen and allowed to react with serially diluted antiserum in the presence of two complete units of guinea-pig complement for 3 hr. at 4°C. and ½ hr. at 37°C. before the addition of sensitized cells. Serum was unheated and used either fresh or within one month of storage at −30°C. Individual birds showed a rise and fall of complement-fixing antibody both after primary and secondary inoculations. The complement-fixing antibody was detected as early as the seventh day after primary inoculation. The highest complement fixation titre (1/32 to 1/64) was recorded from 14 to 21 days after inoculation with a subsequent gradual decline.

The results of the direct complement fixation tests have been correlated with the serum neutralization test. The neutralizing antibodies usually appeared by the 14th day but were not detected at a significant titre until the 21st day after primary inoculation. Serum neutralizing antibodies were still present at high titres even after 7 weeks of infection but the complement-fixing antibodies had disappeared by that time.

Type
Research Article
Information
Journal of Hygiene , Volume 68 , Issue 2 , June 1970 , pp. 211 - 219
Copyright
Copyright © Cambridge University Press 1970

References

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