is an infectious disease caused by the Vibrio
cholerae bacteria. The vast majority of cases can be
traced to water sources contaminated by human waste. The
bacteria causes diarrhea which can lead to dehydration.
The dehydration, combined with other chemical changes
within the body, can cause death within five days of
symptoms first appearing.
is a highly infectious disease caused by
the Yersinia pestis bacteria, which is most
commonly transmitted to humans by fleas from infected
rats. In the mid-1300's, an epidemic of plague killed an
estimated 25 million people in Europe over a span of five
is an infectious disease caused by Salmonella
typhimurium bacteria. Relatively rare
in areas with modern sanitation practices, it is a
serious health threat in the developing world, especially
for children. Worldwide, typhoid fever affects more than
21 million people annually, with about 200,000 people
dying from the disease.