In the present study, 800 chickens

In the present study, 800 chickens and 550 ducks suffering from colisepticaemia, collected from different
governorates, were examined for pathogenic E. coli. The incidence of E. coli isolation was
(43.1%) in chickens and (27.2%) in ducks. In chickens, the highest incidence was reported in Cairo
Governorate (58.7%), followed by Fayoum (38%), Alexandria (30%), and El-Sharkia (23.5%). In
ducks, the highest incidence was reported in Fayoum Governorate (35%), followed by Cairo
(27.2%), El-Sharkia (24.4%), and Alexandria (21.4%). The incidence of E. coli in one day old living
diseased chicks was (28.7 %), while in freshly dead chicks it was (15.5%). The incidence of E. coli in over one week old living diseased chickens was (80.5%), while in freshly dead chicks it was
(62.2%). The incidence of E. coli in one day old living diseased ducklings was (26.8 %), while in
freshly dead ducklings it was (23.8 %). The incidence of E. coli in over one week old living diseased
ducks was (30.8 %), while in freshly dead ducks it was (28.4%). The typing of 345 E. coli
strains isolated from different organs of chickens revealed that, 263 strains could be identified serologically.
They belonged to 24 different serogroups. The most commonly isolated O groups in
chickens were O44, O158, O114, O91, O111, O125, O103, O142, O26, O78, O127 andO164. The
typing of 150 E. coli strains recovered from different organs of ducks revealed that 84 strains could
be identified serologically. They belonged to 15 different serogroups. The most prevalent O groups
in ducks were O158, O103, O125, O44, O114, O91, O111 and O78.