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Washington Woman Diagnosed with Malaria Did Not Travel Outside of US

PIERCE COUNTY, WASHINGTON, AUG 6 – Health officials are investigating after a Pierce County woman was diagnosed with malaria without recent travel; the U.S. reported 10 locally acquired cases in 2023, the first in 20 years.

  • A woman in Pierce County, Washington, was diagnosed with malaria on August 2, 2023, despite not having traveled recently.
  • Health officials and the Tacoma-Pierce County Health Department are investigating this possible first locally acquired case in Washington, considering mosquito transmission from a travel-related malaria case.
  • Health officials are cooperating alongside state health authorities and the CDC to carry out mosquito trapping and testing efforts, while observing that mosquito numbers in the county are currently declining.
  • Dr. James Miller noted that malaria is uncommon in the United States, with most infections linked to travel in regions where the disease is actively transmitted, and that the likelihood of infection in Pierce County is very low.
  • This case highlights the need for continued mosquito bite prevention and early diagnosis, while the investigation may inform monitoring of locally acquired malaria risks in the U.S. going forward.
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Komo News broke the news in Seattle, United States on Wednesday, August 6, 2025.
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