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Summary
A sero-prevalence study of Infectious Laryngotracheitis (ILT) virus antibodies was
conducted in five states in the Sudan. A total of 919 serum samples was randomly collected
from commercial and local chicken flocks. The birds were 24-6 months old and nonvaccinated
against ILT disease. The Sera were screened using agar gel immunodiffusion
(AGID) test to detect specific antibodies against ILT virus, and then the samples were
subjected to the indirect ELISA test for more confirmation. The sero-prevalence of ILT
antibodies in all samples using AGID reached 25.46% and reached 96.7% using ELISA. A
mean of sample value related to positive control value (serum to positive ratio “S/P”) was
calculated. The highest mean (S/P = 1.27) was recorded in samples collected from local flock
at Sinnar state , followed by mean S/P of 1.18, 1.05, 0.97and o.66 for the samples collected
from White Nile, River Nile (Atbara), Khartoum and El Gedarif state, respectively. This is
the first study for the detection of ILT virus antibodies in the Sudan.
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