If the current strain of H1N1 swine flu is like flu strains of years past, it likely will mysteriously subside in the coming weeks.
For whatever reason, in temperate areas such as North America, flu largely is a fall and winter phenomenon.
A couple of theories have tried to explain that seasonality, but in recent years an intriguing new idea has emerged:
Levels of flu-fighting vitamin D reach their lowest point in the winter when ultraviolet light disappears.
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