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Who Is At Risk for Hypersensitivity Pneumonitis?

People who repeatedly breathe in foreign substances are at risk for hypersensitivity pneumonitis (HP). These substances, which also are known as antigens, include molds, dusts, and chemicals. However, most people who breathe in these substances don't develop HP.

People at increased risk include:

  • Farm and dairy cattle workers
  • People who use hot tubs often
  • People who are exposed to molds or dusts from humidifiers, heating systems, or wet carpeting
  • Bird fanciers (people who keep pet birds) and poultry handlers
  • Florists and landscapers, especially those who use liquid chemicals on lawns and gardens
  • People who work in grain and flour processing and loading
  • Lumber milling, construction, wood stripping, and paper and wallboard workers
  • People who make plastics or electronics, and those who paint or work with other chemicals
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Last Updated: May 9, 2014