Studied were a total of 488 Salmonella strains isolated from food products and washings from productional surfaces for the presence of variants, with the use of tests of producing gas from glucose and hydrogen sulfide and the coincidence of the two properties. It was found that 7 species only had biochemical variants. Most frequent were the variants with S. cholerae suis. Biochemical variants were found in 24.79 per cent of the typed Salmonellae, these of the S. cholerae suis species being 19.26 per cent -- 7.58 per cent were gas-negative, 6.14 per cent were hydrogen sulfide-negative, and 5.53 per cent were simultaneously gas- and hydrogen sulfide-negative. The coincidence was 5.53 per cent, i.e., it lower than the values average for the biochemical variants as cited in the literature. Of all investigated strains of Salmonellae 12.6 per cent were gas-negative, 6.55 per cent--hydrogen sulfide-negative, and 6.35 per cent -- gas- and hydrogen sulfide-negative. The lower values found -- as compared to those of Ewing and Ball -- could be explained by the fact that 77.68 per cent of all biochemical variants belong to Salmonella cholerae suis.
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