The number of people who get diseases transmitted by mosquito, tick, and flea bites has more than tripled in the United States in recent years. Since 2004, at least nine such diseases have been newly discovered or introduced into the United States.

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The number of people who get diseases transmitted by mosquito, tick, and flea bites has more than tripled in the United States in recent years. Since 2004, at least nine such diseases have been newly discovered or introduced into the United States.