الفهرس 
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Abstract
The aim or This thesis was to study the incidence of Salmonellosis among
newlv hatching duckling (local and imported) and duck eggs The incidence
among the duck eggs was 18.18%. whereas it was 14.42% among the imported
one day old ducklings and 9.44% among the local day old ducklings. Virulence
attribute con firmed that all 0 I’ the Salmonella isolates were Congo red positive
but with different combining intensities but only 69.23% of the examined
isolates are mannose resist against both duck and chicken RBCs. 64.15 %
against human RBCs and only 26.9% against guinea pig RBCs .also
0111)’46.15% were survived in duck sera for 6 hours while only 38.46% in
chicken sera. S Enteritidis. S. Shubra and S. Haifa were indicated 100%
cytopathic effect at all toxin dilutions (1120 - 1/320). The highest mortality was
ccn in the mice infected with S. Enteritidis, S. Eingedi and S. Haifa «
80%).The isolates differ in its sensitivity against 16 different antibiotics. The
result indicated that at an increased temperature. Salmonella serovars produced
heat shock proteins in vitro. Also day old ducklings that have been
experimentally infected produced heat shock proteins implying that some of
these proteins are made in vivo.