a1 Health of Animals Laboratory, 110 Stone Road West, Guelph, Ontario, N1G 3W4, Canada
a2 Health of Animals Laboratory, 3400 boul. Casavant Ouest, St. Hyacinthe, Quebec, J2S 8E3, Canada
a3 Health of Animals Laboratory, P.O. Box 1410, 4 College St., Sackville, N.B., E0A 3C0, Canada
a4 Laboratory Services Division, Central Experimental Farm, Ottawa, Ontario, K1A 0C6, Canada
A nation-wide survey was conducted to estimate the prevalence of Salmonella enteritidis and other salmonellas among Canadian commercial broiler flocks. Environmental (litter and/or water) samples from 226 of 294 (76·9%) randomly selected flocks were contaminated with salmonellas. Litter samples were more often contaminated with salmonellas than water samples (47·4 ν 12·3%). Fifty different salmonella serovars were isolated. The most prevalent serovars were S. hadar, S. infantis, and S. schwarzengrund; they were isolated from samples of 98/294 (33·3%), 26/294 (8·8%), and 21/294 (7·1%) flocks, respectively. Feed samples of 39/290 (13·4%) flocks were contaminated with salmonellas. Salmonella enteritidis was isolated from the environmental samples of 9/294 (3·1%) flocks. Salmonella enteritidis phage type (PT) 8 was isolated from seven flocks, and PT 13a from two flocks.
(Accepted January 09 1991)