A new strain of influenza, HINI, is a highly virulent strain that spread all over the world. This type of epidemiological disease pattern is referred to as a(n)

A new strain of influenza, HINI, is a highly virulent strain that spread all over the world. This type of epidemiological disease pattern is referred to as a(n)



A. cluster.


B. outbreak.


C. epidemic.


D. pandemic.



Answer: D


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