Important Updates on Locally Acquired Malaria Cases Identified in Florida, Texas, and Maryland
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Important Updates on Locally Acquired Malaria Cases Identified in Florida, Texas, and Maryland

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      Distributed via the CDC Health Alert Network

      August 28, 2023, 2:15 PM ET

      CDCHAN-00496

      The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Update to share new information with clinicians, public health authorities, and the public about locally acquired malaria cases identified in the United States. On August 18, 2023, a single case of locally acquired malaria was reported in Maryland in the National Capital Region. This case was caused by the Plasmodium falciparum (P. falciparum) species and is unrelated to the cases involving local transmission of Plasmodium vivax (P. vivax) malaria in Florida and Texas described in the HAN Health Advisory 494 issued on June 26, 2023. As an update to that report, to date, Florida has identified seven cases and Texas has identified one case of locally acquired P. vivax malaria, but there have been no reports of local transmission of malaria in Florida or Texas since mid-July 2023.

      P. falciparum malaria can rapidly cause severe illness and even death if not quickly diagnosed, therefore rapid diagnosis and treatment is imperative. In addition to routinely considering malaria as a cause of febrile illness among patients with a history of international travel to areas where malaria is transmitted, clinicians should consider a malaria diagnosis in any person with an unexplained cause of fever, regardless of their travel history. The risk to the U.S. public for locally acquired mosquito-transmitted malaria remains very low. The most effective way to prevent malaria in the United States is for travelers to malaria-endemic areas to take appropriate steps to prevent acquiring malaria while traveling—including taking medications to prevent malaria—and ensuring early diagnosis and treatment of imported cases of malaria and preventing mosquito bites.

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      HAN ; 496
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      Health Update
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