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.

1. Safety pin appearance is seen in
2. Causative organism of plague
3. Types of plague
4. Microbiology – MCQ 11 – A person working in an abattoir presented with a papule on hand, which turned into an ulcer.