Title: Tritrichomonas suis: isolamento, morfologia e incidência na cavidade nasal de porcos domésticos do Rio Grande do Sul
Abstract: The Trichomona that occur in the nasal cavity of domestic swine, Sus scrofa, was isolated, described and its incidence studied in healthy swine of different areas of Rio Grande do Sul. The morphological study of the live specimens done by phase contrast microscopy, dark field microscopy and by examination of fresh and stained specimens, showed that the Tritrichomanas suis isolated has the same morphological caracteristics as the nasal cavity Trichomonas previously described by other authors. The protozoa was found in 9 out of 107 cultures of nasal washings, representing an incidence of 8,4%.