Hypersensitivity Pneumonitis Due to Contamination of a Car Air Conditioner

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Abstract
To the Editor: Contamination of home or office air conditioners with thermophilic actinomycetes has been reported to cause hypersensitivity pneumonitis.1 We report here a case of hypersensitivity pneumonitis related to a car air conditioner.A 40-year-old male nonsmoker presented with a three-week history of intermittent fever, nonproductive cough, and dyspnea without wheezing each day, six hours after he drove one of his cars with the air conditioner turned on. He had no such symptoms on the days when he drove his second car or used public transportation.The pulse rate was 110 per minute, the temperature 38.2°C, and the blood . . .