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ShadowWatcher ago

How do you think they spread the flu??? The flu doesn't have a calendar to know exactly when the show up at the same time every year.

Gringojones ago

Meh. That's a weather related thing. Plants don't work based on calendars either.

Think about this one though. Does anyone know which strain of the flu will show up this year? How often does the vaccine given each year match that strain?

ShadowWatcher ago

Plants react directly to the Sun, no sun no plants. Viruses can come anytime of the year even in the dark. It's not quite the same but I get where you were going.