الفهرس 
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Abstract
The role of Proteus organism in eggs, embryos and chicks was studied during the present *ork.
Bacteriological examinations revealed that 98 non— fertile eggs were free from Proteus organisni. while 5 isolates were detected from 187 dead in—shell embryos represent 2.6%.
Out of 310 examined chicks, 33 isolates of Proteus (10.6%) were recovered.
Thirty eight isolates recovered from dead embryos and dead baby chicks proved morphologically and biochemically to be Pr. mirabilis.
Experimental infections to day—old chicks proved
that the disease picture was more severe in case of yolk sac route in comparison with oral route.
Proteus mirabilis isolated from dead chicks and
embryos were fatal to infected 7—day—old embryos in rate of 100%, 80% respectively.
In vitro sensitivity test of Proteus irabilis
revealed that the tested isolates were highly sensitive to gentamycine and kanamycine.