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What causes the flu virus to become dormant?

Asked by Dog (25152points) April 29th, 2009

“The 1918 flu was first reported in March of that year, in Kansas’s Haskell County, according to the U.S. Department of Health and Human Services. The flu then became dormant in the U.S. for the summer, re-emerging in a more severe form in the fall of 1918, with a final wave of illness in the spring of 1919. ”

What is the reason for the virus to go dormant? It cannot be that people get out more as folks still work indoors and gather for community functions.

Is there a viral anatomical trigger aiding this process?
Is it an environmental trigger?

What is the process?

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