[ Case 1]

December 2002 to May 2003, a county high school in the south has 147 students with acute infectious hepatitis. By the provincial CDC experts to investigate: the outbreak of acute infectious hepatitis epidemic in the secondary school is mainly water source transmission of this infectious hepatitis transmission. The school's own well water quality test results show that: the well is contaminated by feces, E. coli bacteria in the water seriously exceeded the standard, and the vast majority of the hepatitis A virus are hidden in the feces.

[ Case 2]

In 2003, a secondary school in a county in the south of the country, due to the contamination of the school drinking water wells were contaminated and typhoid fever outbreaks occurred, a *** 116 students due to the drinking of contaminated water (drinking raw water habits) have been infected with this typhoid fever, typhoid fever symptoms.

These two cases are typical cases of waterborne transmission.

[ Case 3]

In September 2004, a middle school in the western region was infected with typhoid fever due to the fact that two cooks and two waiters in the cafeteria were healthy carriers of typhoid fever, which led to an outbreak of typhoid fever among six students.

This example is a typical case of foodborne transmission.