The link is very important and it is also important to link it back to the Black Death in the 1300s because there were the kind of weather conditions then -- warmer and wetter -- that we predict for the future.

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Many, many bird species are spreading bacteria from one place to another, from one rodent to another, by carrying fleas.

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After 1855, when it (plague) reappeared again, there were once again similar weather conditions.

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