Comparative Study of Pathogenic Staphylococci Isolated from Man and Animals

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Ibrahim Omer Farah, Farah
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The biotyping method of Hajek and Marsalek (1971) was used to biotype 844 Staphylococcus aureus strains which were isolated from man, cattle, sheep, goats and camels, both locally and from abroad. According to this method, Staph. aureus is divided into six biotypes namely A, B, C, D, E and F. The biotyping revealed that the animals were carriers of the human biotype A, and animal biotype C. In addition, the animals carried strains which were untypable by this method. These were designated as non-allotted strains. The results showed that these three groups namely biotype A, biotype C and the non-allotted strains were found at the rate of 25.7%, 53.1% and 21.1% in the cattle isolates, 10.2%, 61.1% and 28.7% in the sheep isolates, 4.2%, 76.4% and 19.4% in the goat isolates and 6%, 76%, and 18% in the camel isolates, respectively. Unlike the animal isolates the human group of isolates revealed only one biotype "human biotype A". Biotypes B, D, E and F were not recorded for both groups. A trial using the phage-typing parameter to differentiate the strains grouped under biotype C into host-specific strains within this biotype was made. For simplifying the method of identification of these biotypes the plasma crystal violet agar medium was formulated. It was possible by the use of this medium to differentiate biotypes A, C and the non-allotted strains irrespective of their sources. The results of biotyping, differentiation of biotype C strains with respect to host species, and the formulated medium were discussed in relation to the findings of other authors.
Comparative Study of Pathogenic Staphylococci Isolated from Man and Animals