Southeast Asia, Africa

Severe vomiting and excessive diarrhea
Excessive diarrhea causes dehydrate
If an infected person doesn’t drink water, the person can’t control one’s body temperature and pass urine.

Vibrio cholerae multiplies in infected patient’s intestines and makes toxin.

In developing country, people excrete in the river.
They use the river’s water for daily life.
It causes the infection spread.