Journal of the Japan Veterinary Medical Association
Online ISSN : 2186-0211
Print ISSN : 0446-6454
ISSN-L : 0446-6454
Avian Infectious Laryngotracheitis Live Virus Vaccine for Broiler Chicks
SHINJI YAMADA[in Japanese][in Japanese]
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1978 Volume 31 Issue 7 Pages 414-417

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Abstract

Two groups, 1 and 2, of broiler chicks were inoculated with avian infectious laryngotracheitis live virus vaccine at the age of 4 and 14 days, respectively. Mild reaction was noticed, but disappeared by 7 days after inoculation. Mean neutralizing antibody titer was 0.2-0.7 in group 1 and 0.5-1.1 in group 2 at the age of 40-70 days.
There was a relationship between the neutralizing antibody titer and the rate of prevention of chicks from infection.
When that titer exceeded 1.1, this rate was more than 80 per cent.

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