Wayson stain of Yersinia pestis showing characteristic safety pin appearance Wayson stain is a modified methylene blue stain used to demonstrate Yersinia pestis for diagnosis of bubonic plague.
Clostridium perfringens Previous name of Clostridium prefringens, an anaerobic, spore forming, gram positive bacilli. It causes many conditions such as gas gangrene, food poisoning, gangrenous appendicitis and necrotising
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