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In response to "you cannot talk swine flu while I'm at lunch! -- nm" by loosilu

OK. So, yes, officials are puzzled why there are more deaths in Mexico and why it is killing adults in their prime.

it's perplexing because that's not the normal pattern.

As for international travel, that certainly can bring the virus into the city. But once it arrives and starts spreading from person to person, you expect it to hit the immunocompromised.

This is the same pattern that was seen in the 1918 flu. The theory as to why that flu hit young adults the hardest is that older people had probably been exposed to a milder version of a related strain during an outbreak many decades earlier.


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