Neonatal infections in puppies caused by Escherichia coli serogroups 04 and 025

Three cases of neonatal E. coli infection in Newfoundland dogs are described. The serological examination showed that the implicated E. coli belonged to sero-group 04 in two outbreaks while sero-group 025 was responsible for one outbreak. In one of the kennels with implication of 04, this 0-group was also isolated from adult dogs with diarrheal conditions.