Question

The majority of the children in India are immune to Hepatitis A at the age of 5 years old because

• A. they are immunized with the vaccine at the time of birth
• B. their immune systems are resistant to the Hepatitis virus
• C. the children are already exposed to the virus through water
• D. all of the above

Answer 1

The correct option is

C

the children are already exposed to the virus through water

The virus of Hepatitis A spreads through contaminated water and there are many children below the age of 5 who get infected with this disease through the polluted water. The infection of this disease is mild during the early stages of life, that is, childhood, and they develop antibodies for this disease, as a result, the majority of children in many parts of India are already immune to Hepatitis A. This is an example of active immunity.