Hypersensitivity pneumonitis epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

• The prevalence of HP varies significantly by region, climate, occupation/exposure and farming practices.

• Farmers:
  • US: 8-540 cases per 100,000 persons per year among those at risk
  • UK: 420-3000 cases per 100,000 persons per year among those at risk
  • France: 4370 cases per 100,000 persons per year among those at risk
  • Finland: 1400-1700 cases per 100,000 persons per year among those at risk

• Pigeon Breeders: 6000-21,000 cases per 100,000 persons per year

• Bird Fanciers: 20-20,000 cases per 100,000 persons per year

• Attack rates vary considerably, but can be high in sporadic outbreaks. For example a large proportion (52%) of office workers exposed to an infected humidifier were affected in one outbreak, and in another outbreak 27% of workers at a molding plant for polyurethane foam parts were affected.

• The male to female ratio is approximately 1.2:1.

• The mean age of the patients with HP is 61 ± 0.7 years (epidemiologic data from Spain).

References

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