الفهرس 
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Abstract
A total of 498 samples (398 eggs and 100 environmental swabs)
were collected from two different chick hatcheries in Gharbeia and
Dakahlia Governorates. The egg samples included infertile eggs, eggs
contain dead embryos at different ages (7, 11, and 14 days) and dead in
shell embryos more than 14 days of age. The environmental swabs were
taken from hands of workers, egg trays, egg delivery point, walls of
hatchery, floors of hatchery, walls of incubators, floors of incubators and
refrigerators. These randomly collected samples were subjected to aerobic
bacteriological examination in a trial to detect the actual bacterial causes of
this problem.
The results of bacterial isolation revealed that Proteus species were
the most prevalent organisms isolated from dead in shell embryos with
high an incidence of (34 .1%) , eggs contain dead embryos with an
incidence of (30.8 %), and from infertile eggs with an incidence of (11.9
%). Also the rate of isolation from environmental swabs of different parts
of egg hatcheries reached to ( 8.6 %) .
The Bacillus species were the most prevalent organisms isolated
from dead in shell embryos with high an incidence of (11.4 %), from
infertile eggs with an incidence of (3 %) and from both eggs contained
dead embryos and environmental swabs with the incidence of (6.4%,5.2
%) respectively .