الفهرس 
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Abstract
The prevalence of salmonellae among layer farms was investigated in
this study which cover different provinces in Egypt, methods used for
this purpose was ISO 6579 for isolation and identification of Salmonella
and Kauffmann- White scheme for Salmonella serotyping. Also to define
some aspects of the progress of infection with SE in commercial laying
hens, methods used for this purpose were serological detection of SE
antibodies by ELlSA, detection of SE by ISO 6579 and peR, application
of most probable number for SE and detection of the inhibitory effect of
egg yolk on SE.