An attempt was made to isolate Salmonella(S) organisms from a total of 4,587 fecal samples of birds during the period from May 1987 to March 1988, and serotype and biotypes of the isolates were also investigated.
One hundred and sixty-six Salmonella strains were isolated from 151(3.3%) of 4,587 fecal samples of birds, and their serotype was all identified as S typhimurium var copenhagen. The positive samples of S typhimurium var copenhagen were 149 samples(5.1%) in pigeons and 2 samples (0.8%) in aquatic birds. No Salmonella was obtained from ducks, pheasant, and other birds.
The isolation frequencies of S typhimurium var copenhagen from pigeons varied from 1.1 to 12.8% at 5 parks, it was higher in September and November.
Biotypes of 166 S typhimurium var copenhagen strains isolated from pigeons and aquatic birds were all biotype 10 according to Brandis´ method, and were biotype 25hi (78.3%), 27 hi (14.5%), 25 fhi (3.6%), 25 bhi (1.8%), 27 bhi (0.6%), 27 hiz (0.6%), and 9 hi (0.6%) according to Duguid´s scheme. Appearance of different biotypes indicated the occurrence of exotic infection sources on the parks.
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