Severe recurrent pneumonitis occurred in a 6-year-old city boy who lived near a market in which live chickens were sold. His pulmonary disease improved when he was removed from the area. He was shown to have precipitins to an antigen prepared from hen litter. These antibodies decreased as he improved.
Korn DS, Florman AL, Gribetz I. Recurrent Pneumonitis With Hypersensitivity to Hen Litter. JAMA. 1968;205(1):44–45. doi:10.1001/jama.1968.03140270068018
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