Research Article
Delayed Hypersensitivity Reaction as a Measure of Cell Mediated Immunity in Chickens Vaccinated with Sonicated Coccidial Vaccine

Masood Akhtar, C.S. Hayat, M. Ashfaque, I. Hussain, Murad Ali Khan and Sultan Ayaz

Pakistan Journal of Biological Sciences, 2000, 3(6), 1094-1095.

Abstract

Delayed hypersensitivity reaction was used to measure the cell mediated immunity against avian coccidiosis. There was a gradual increase in the comb thickness of the immunized birds of all the groups from 24 to 72 hours after intradermal injection. The mean difference in comb thickness before and after injection of the respective antigen for the group immunized with Vaccine I (sonicated supernatant) was 1.87 mm at 24 hours, 2.23 mm at 36 hours, 2.31 mm at 48 hours and 2.42 mm at 72 hours. There was a significant difference (p<0.01) in comb thickness at 24 and 36 hours after intradermal injection. The mean difference in comb thickness before and after injection of the respective antigen for the group immunized with Vaccine II (sonicated sediment) was 1.12 mm at 24 hours, 1.75 mm at 36 hours, 2.10 mm at 48 hours and 2.31 mm at 72 hours. The difference was significant (p<0.01) at 24 and 48 hours; 36 and 72 hours after injection. Maximum difference in comb thickness was recorded 72 hours after injection in birds immunized with Vaccine I. It appears that delayed hypersensitivity response to sonicated supernatant antigen reported herein represent a strong CMI reaction. Delayed hypersensitivity comb reaction is a quick, simple, economical and practical tool to routinely determine the immune status of a bird with out restoring to challenge.

ASCI-ID: 1-1510

Cited References Fulltext

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