yer·sin·i·a 
(yər-sĭnē-ə)
(yər-sĭnē-ə)n. pl. yer·sin·i·ae (-ē-ē′)
A gram-negative bacterium of the genus Yersinia that causes various diseases in animals and humans, including plague.
[From New Latin Yersinia, genus name, after Alexandre Émile Jean Yersin (1863-1943), Swiss-born French bacteriologist.]