الفهرس 
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Abstract
In the this study the incidence of CIAV infections in chickens
in Egypt was carried out through.
The incidence of CIAV infectious in broiler chicks , broiler
breeder chickens and native breed flocks were monitored in Sharkia
and Ismailia governorates Egypt. Twenty broiler breeder , broiler
and native breed flocks suspected to be CIAV infected were
examined and the observed clinical signs and post mortem lesions
recorded . The samples were collected for detection of CIAV
genome by PCR assay and for studying the pathogenicity of the
positive PCR isolates in day-old SPF chicks.
The observed clinical signs were uneven growth, depression,
pale comb and wattle ; increase coast of medications and high
mortalities ranged from 10-70% and 5% in both broilers and breeders
respectively. Meanwhile the gross lesions were hemorrhage on the
tip of the wings; subcutamious and musculature; thymic and bursal
atrophy; enlarged and molted liver and due to secondary bacterial
infections gangarenious dermatitis, airsaculites, pericarditis and peri
hepatitis were observed in some dead birds.
Tissue specimens from (thymus, bursa, spleen, bone marrow
and liver) were collected from each flock and pooled to extraction of
CIAV DNA genome and select primer of 676 bp fragment for the
detection of CIAV by using PCR assay. Four samples representing
four flocks out of twenty examined flocks were positive CIAV
infections.
The identification and characterization of the 4 detected CIAV
isolates revealed that the four CIAV strain isolates were identified.