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Left: Eggs of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). These eggs measured 80-90 µm by 40-45 µm. The species was not identified in this case. Right: P. westermani adult, this approximately 1cm long fluke is viewed under magnification.

Paragonimus is a lung fluke (flatworm) that infects the lungs of humans after eating an infected raw or undercooked crab or crayfish. Less frequent, but more serious cases of paragonimiasis occur when the parasite travels to the central nervous system.

Although rare, paragonimiasis has been acquired in the United States, with multiple cases reported from the Midwest. Once the diagnosis is made, effective treatment for paragonimiasis is available from a physician.

Image: Left: Eggs of Paragonimus sp. taken from a lung biopsy stained with hematoxylin and eosin (H&E). These eggs measured 80-90 µm by 40-45 µm. The species was not identified in this case. Right: P. westermani adult, this approximately 1cm long fluke is viewed under magnification. Credit: DPDx

  • Page last reviewed: January 10, 2013
  • Page last updated: January 10, 2013
  • Content source:
    • Global Health - Division of Parasitic Diseases and Malaria
    • Notice: Linking to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site.
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