Fatal cases of farmer's lung in a Canadian family. Probable new antigens, Penicillium brevicompactum and P olivicolor.

Three Canadian farmers, including a married couple and another close relative, died from progressive pulmonary fibrosis. Their histories and investigations were compatible with chronic farmer's lung (FL). Our environmental and immunologic studies indicate Penicillium brevicompactum and P olivicolor as probable new antigens of FL in a cool and dry climate.