Showing posts with label Plague. Show all posts
Showing posts with label Plague. Show all posts

Saturday, 17 November 2012

Plague

Blackened skin. Swollen lymph nodes. Rats and other pests. Fleas. Ew.
You know what I'm talking about. The Plague.
It's caused more human deaths than any other infectious disease, save for malaria and tuberculosis.[1]

It's caused by the bacteria Yersinia pestis, a gram-negative, rod-shaped bacterium.
It's primary host is the rat, and the intermediate hosts between rats and humans are fleas. (Guess that gives me another reason to lay down rat/mouse traps.)
Since it primarily infects rats, but sometimes infects humans as well, it is a zoonotic disease. (disease which primarily infects animals, although it can also cause disease in humans)
Infected rats generally die soon after infection, but the survivors develop a chronic condition in which the animal can keep transferring the disease to other organisms.[1]
Alright, my little pet hamster doesn't carry fleas,
but that isn't the case for every pet rodent..
Yersinia pestis can cause multiple forms of plague:
- Sylvatic plague
- Bubonic plague
- Septicemic plague
- Pneumonic plague