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Bronchopulmonary infections caused by trichomonads have been reported mainly in patients with pre-existing pulmonary or debilitating disease (e.g. bronchial carcinoma, lung abscess, bronchiectasis). Pulmonary trichomoniasis is most often due to infection with Trichomonas tenax, usually regarded as a harmless commensal of the human mouth, and may rarely be caused by other trichomonas species. A 45 year old female presented with a dry cough, exertional dyspnoea and malaise. These symptoms persisted for 6 months regardless of anti-inflammatory and anti-obstructive inhalative therapy. Sarcoidosis of the lungs, diagnosed 20 years prior, had been asymptomatic since and there was no coexistent disease. Laboratory data revealed increased ACE-levels (90 IE/ml) and lung function showed bronchial hyperreactivity on histamine challenge. No other abnormalities were found (chest x-ray, bronchoscopy, lung function test, blood count and serum calcium). The diagnosis was based on the cytological identification of numerous trophozoites of T. tenax in the bronchoalveolar lavage. Therapy with oral metronidazol for 40 days led to complete recovery from symptoms and normalisation of ACE serum levels. The patient has remained well for 12 months since. The pathogenicity of oral trichomonads in the non-immunocompromised host remains uncertain. Our patient had no known medical risk factors by comparison with published cases. The case illustrates the clinical relevance of pulmonary trichomoniasis in an otherwise healthy person.

Pulmonale Trichomoniasis: Diagnose durch Erregernachweis in der bronchoalveolären Lavage