U.S. officials warn doctors about dengue as worldwide cases surge

U.S. health officials on Tuesday warned doctors to be alert for dengue cases as the tropical disease breaks international records.The virus, which is spread by mosquitoes, has been surging worldwide, helped by climate change. In barely six months, countries in the Americas have already broken calendar-year records for dengue cases.The World Health Organization declared an emergency in December, and Puerto Rico declared a public health emergency in March.

If they get infected with another type of dengue, the antibodies from the first infection may fail to neutralize the second type —and actually can help the virus enter immune cells and replicate.That's a concern in Puerto Rico, which for the last two decades has been widely exposed to type 1. Last month, the island reported its first dengue death of the year.

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