Trichomonas tenax was recovered from the pleural effusion of a patient with chronic pulmonary disease. Because such a finding is relatively infrequent, it is necessary and important, therefore, that the pleural fluid of such patients be examined by direct microscopic means.
Memik F. Trichomonads in Pleural Effusion. JAMA. 1968;204(12):1145-1146. doi:10.1001/jama.1968.03140250125023