What type of viral infection occurs gradually over a long period of time?
a. acute
b. latent
c. persistent

Persistent Viral infection

Explanation:

Persistent viral infections lasts for long periods of time and it takes place when primary infection is not cleared by the adaptive immune response.

A chronic infection is a type of persistent infection in which is eventually cleared but its infection in actual lasts for a longer duration of time.

Example: HIV-1, measles are some example of persistent viral infections.

So, the viral infection that lasts for a longer duration of time is known as persistent viral infection.

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