In 120 hen eggs ( local eggs , hatching eggs and table eggs ) a bacteriological
pollution with high rate was observed by isolating 427 bacterial isolates from
which 199 isolates related to the egg's shell , 117 isolates related to albumen sac,
and 111 isolates related to yolk sac .
The Salmonella ssp isolates were the greater number (142 isolates) ,
Echerichia coli ( 138 isolates ) , Streptococcus ssp ( 89 isolated) and lately
Staphylococcus ssp ( 58 isolates ) which was never isolated from internal egg
components (Albumen Sac and yolk sac) .
The study explains that the shell of the egg is more contaminated than
Albumen Sac and yolk sac and that the table egg is more contaminated than the
other groups.