الفهرس 
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Abstract
Colibacillosis in chickens caused by avian pathogenic E.coli still
being a major disease problem that affecting all poultry flocks;
broilers, layers and breeders allover the world and specially in Egypt
due to many factors related to management of poultry industry at all.
Many factors share in Colibacillosis arising and make the infection so
economic.
This study was planned to investigate virulence factors among
APEC for the detection of virulence chromosomal genes and for
studying its multidrug resistance profile to correlate the genes
occurrence and drugs activity among chicken flocks: broilers, layers
and breeders in Egypt.
Multiplex PCR technique was applied to detect the virulence
chromosomal genes that may accompanied with its virulence activity.
The results showed that:
Regarding to the results of incidence of L.F. isolates (63%)
showed positive E.coli isolates while (37%) were non E.coli isolates
Regarding to the uptake of congo red dye between the isolates
(78.2%) were positive and were considered invasive and (21.8%) still
white colonies and considered non-invasive.
The results obtained by application of disc diffusion test to detect
the resistant and sensitive antibiotics; the results showed that all
isolates were resistant to rifamycin and were highly resistant to
streptomycin, erythromycin and doxycycline in a percentage of