| epidemiological studies on escherichia coli o157:h7 in egyptian sheep. | in the present work, the epidemiological role of apparently healthy sheep in transmission of escherichia coli o157:h7 in different seasons was investigated. fecal samples (convenience sampling) of apparently healthy farmed sheep (three farms, n = 70) and from 15 wandering flocks fed on city wastes (n = 80) in the giza governorate were examined. the samples were collected in spring under mild weather conditions and during hot summer to be compared. out of the 150 animals, 13 (8.7%) were e. coli o ... | 2015 | 25947238 |