Precipitating antibodies in chromomycosis

Precipitating antibodies to the antigens from the causal organisms of chromomycosis were demonstrated in the sera of 12 out of 13 naturally infected patients. The responses indicate that Phialophora pedrosoi and P. compacta are relatively closely related to each other and more distantly to P. verrucosa. Cladosporium carrionii and P. jeanselmei appear to be quite different from the foregoing. There is a suggestion that antibodies diminish during successful treatment.