[Algae as the cause of irritation cough]

Cases of irritation-cough in personnel and patients of a physiotherapeutical department during treatment by under-water massage were found out as to be due to mass vegetation of a population of Staurastrum gracile Ralfs 1848 in the raw water a no-contaminated surface water. Algae passed the filter element. Outbreak of such an illness in man caused by green algae were unknown hitherto.