Southeast Asia, Africa, East Asia

This disease’ incubation period is 2-3weeks.
After the period, patients will get a high fever.
A rash on the skin called roseola.

Typhoid bacillus multiplies in infected patient’s intestines.
The bacillus enters patient’s blood and passes into the patient’s system.

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