Utilization of horse plasma in coagulase test for Staphylococci isolated from raw milk
DOI:
https://doi.org/10.5433/1679-0359.2005v26n3p381Keywords:
Milk, Staphylococci, Coagulase test, Methodology.Abstract
Staphylococci are frequently related to food poisoning outbreaks that are caused by their enterotoxins. The enterotoxins production is highly correlated to coagulase production, which one is detected in identification of pathogenic strains. Usually the coagulase test is conducted using lyophilized rabbit plasma, or even fresh rabbit blood, separated by sedimentation. The lyophilized plasma has high costs and the fresh material is obtained in small volumes from the animals, what made it unpractical. The objective of this work was evaluating the utilization of an alternative material to rabbit plasma, in this case the horse plasma, in coagulase test for staphylococci isolated from raw milk. So, 410 typical and atypical staphylococci colonies were tested for coagulase production using both plasmas. The results showed 284 (69.26%) positives for coagulase production and 126 (30.73%) negatives, with 100% of concordance between both plasmas. These results indicate the viability in using horse plasma in coagulase test for staphylococci isolated from raw milk, and complementary studies are necessary with strains from different types of food.
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