When to be most careful about catching the flu?

Continuing on my blogification of Peter Norvigs excellent talk, the question is, when to watch out for the flu, e.g. if you live in Denmark?

1) Go to www.google.com/trends/
2) Type in the word “influenza”
3) Select your geographical region (Denmark in my case)
4) See data up to year 2008, to avoid the graph being squished by the outbreak of A(H1N1) (which leads to unusually many people talking about the flu)

Turns out the answer is: watch out in October and February.

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