The most common infectious disease worldwide is Hepatitis B.
Infectious diseases are those diseases that are caused by various microorganisms such as:
- bacteria
- fungi
- virus or
- parasites.
Hepatitis B is a type of infectious disease because it is caused by the viral microorganism, Hepatitis B virus.
To determine the most common infectious disease, the number of people that has been infected by it should be considered.
According to recent statistics, hepatitis B is the most common infectious disease in the world, affecting up to 2 billion people.
Therefore, since it affects up to one-quarter of the world's population, Hepatitis B is the most common infectious disease worldwide.
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