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16199 Medicine

A 55-year-old farmer develops recurrent cough, dyspnea, fever, and myalgia several hours after entering his barn. He has had similar reactions several times previously, especially when he feeds hay to his cattle. Which of the following statements is true?

AThe presence of fever and myalgia indicates that this is an infectious process.
BImmediate-type IgE hypersensitivity is involved in the pathogenesis of his illness.
CThe causative agents are often thermophilic actinomycete antigens.
DDemonstrating precipitable antibodies to the offending antigen confirms the diagnosis of hypersensitivity pneumonitis.
Medicine
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