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Journal of Clinical Microbiology, Feb 1995, 376-380, Vol 33, No. 2
V Kapur, WM Sischo, RS Greer, TS Whittam and JM Musser
Staphylococcus aureus is one of the most common causes of bovine mastitis.
To estimate genetic relationships among S. aureus strains recovered from
cows, 357 isolates from milk samples from worldwide localities were
examined for electrophoretic variation at 13 metabolic- enzyme loci.
Thirty-nine electrophoretic types which represented distinctive multilocus
enzyme genotypes were identified, and nearly 90% of all isolates were
assigned to one of eight clones. Genetic heterogeneity was found among
organisms recovered from dairy herds from which multiple isolates were
obtained, indicating that the S. aureus population in a single herd can be
multiclonal. Although humans and cows shared 7 of the 39 S. aureus clones,
each clone was predominantly associated with one of these host species.
These results are consistent with the concept of host specialization among
S. aureus clones and imply that successful transfer of bacteria between
humans and cows is limited.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Molecular population genetic analysis of Staphylococcus aureus recovered from cows
Department of Pathology, Baylor College of Medicine, Houston, Texas 77030.
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