Hemolytic and urease activities in vibrios isolated from fresh and frozen oysters

INTRODUCTION: The present study aimed to survey the Vibrio microbiota of oysters (Crassostrea rhizophorae) obtained from restaurants in Fortaleza, State of Ceará, Brazil, and to identify virulence factors. METHODS: The isolated vibrios were submitted to biochemical identification and were tested for hemolytic and urease activities. RESULTS: The isolated strains belonged to 13 species, with predominance of Vibrio mimicus. Of the strain isolates only from fresh samples, 20.5% and 2.8% showed hemolytic and urease activities, respectively. CONCLUSIONS: The findings support the little-publicized claim that Vibrio species other than V. parahaemolyticus and V. vulnificus can represent a health risk to public health.

引言：本研究旨在调查巴西塞阿拉州福塔莱萨市餐厅采购的红树林牡蛎（Crassostrea rhizophorae）中的弧菌菌群，并鉴定其毒力因子。
方法：对分离得到的弧菌进行生化鉴定，并检测其溶血活性与脲酶活性。
结果：分离得到的菌株隶属于13个物种，其中拟态弧菌（Vibrio mimicus）为优势菌种。仅从新鲜样本中分离的菌株里，分别有20.5%与2.8%的菌株表现出溶血活性与脲酶活性。
结论：本研究结果佐证了鲜为人知的论断——除副溶血性弧菌（Vibrio parahaemolyticus）与创伤弧菌（Vibrio vulnificus）之外的弧菌物种，同样可能对公众健康构成健康风险。