4 doctors weighed in:

Why do people get influenza more than once but measles just once?

4 doctors weighed in
Dr. John Leander Po
Internal Medicine - Infectious Disease
3 doctors agree

In brief: Viruses not same

Influenza and measles are different viruses.
Once infected with measles, we produce antibodies that preventing it from infecting cells in the body on repeated exposures. Though a similar response occurs to influenza, over time (ie a year) this virus alters the areas on its surface so that our antibodies we made the year prior, can't stop the "mutated" influenza virus from infecting cells.

In brief: Viruses not same

Influenza and measles are different viruses.
Once infected with measles, we produce antibodies that preventing it from infecting cells in the body on repeated exposures. Though a similar response occurs to influenza, over time (ie a year) this virus alters the areas on its surface so that our antibodies we made the year prior, can't stop the "mutated" influenza virus from infecting cells.
Dr. John Leander Po
Dr. John Leander Po
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