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The genus Trichomonas includes polymorphic parabasalid flagellates (5-30 µm) with four free anteriorly directed flagella and a short recurrent flagellum associated with an undulating membrane shorter than the body; no free posterior recurrent flagellum. Costa relatively slender, axostylar trunk protruding posteriorly; parabasal body V-shaped with one or two long parabasal filaments. Amoeboid and polymastigotes forms present in natural or culture conditions. Several species living in the genitor-urinary tract of humans such as T. vaginalis, the mouth such as T. tenax or in the instestine of birds such as T. gallinae. This is Trichomonas vaginalis with four anterior flagella, undulating membrane, posterior axostyle, nucleus (Giemsa staining).
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The genus Trichomonas includes polymorphic parabasalid flagellates (5-30 µm) with four free anteriorly directed flagella and a short recurrent flagellum associated with an undulating membrane shorter than the body; no free posterior recurrent flagellum. Costa relatively slender, axostylar trunk protruding posteriorly; parabasal body V-shaped with one or two long parabasal filaments. Amoeboid and polymastigotes forms present in natural or culture conditions. Several species living in the genitor-urinary tract of humans such as T. vaginalis, the mouth such as T. tenax or in the instestine of birds such as T. gallinae. This is Trichomonas vaginalis with four anterior flagella, undulating membrane, posterior axostyle, nucleus (Giemsa staining).
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The genus Trichomonas includes polymorphic parabasalid flagellates (5-30 µm) with four free anteriorly directed flagella and a short recurrent flagellum associated with an undulating membrane shorter than the body; no free posterior recurrent flagellum. Costa relatively slender, axostylar trunk protruding posteriorly; parabasal body V-shaped with one or two long parabasal filaments. Amoeboid and polymastigotes forms present in natural or culture conditions. Several species living in the genitor-urinary tract of humans such as T. vaginalis, the mouth such as T. tenax or in the instestine of birds such as T. gallinae. Image of Trichomonas vaginalis with short undulating membrane, posterior axostyle, nucleus (Giemsa).
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The genus Trichomonas includes polymorphic parabasalid flagellates (5-30 µm) with four free anteriorly directed flagella and a short recurrent flagellum associated with an undulating membrane shorter than the body; no free posterior recurrent flagellum. Costa relatively slender, axostylar trunk protruding posteriorly; parabasal body V-shaped with one or two long parabasal filaments. Amoeboid and polymastigotes forms present in natural or culture conditions. Several species living in the genitor-urinary tract of humans such as T. vaginalis, the mouth such as T. tenax or in the instestine of birds such as T. gallinae. Image of Trichomonas vaginalis with four anterior flagella, a recurrent flagellum associated with an undulating membrane, axostyle (Immunofluorescence with an anti-tubulin antibody).
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The genus Trichomonas includes polymorphic parabasalid flagellates (5-30 µm) with four free anteriorly directed flagella and a short recurrent flagellum associated with an undulating membrane shorter than the body; no free posterior recurrent flagellum. Costa relatively slender, axostylar trunk protruding posteriorly; parabasal body V-shaped with one or two long parabasal filaments. Amoeboid and polymastigotes forms present in natural or culture conditions. Several species living in the genitor-urinary tract of humans such as T. vaginalis, the mouth such as T. tenax or in the instestine of birds such as T. gallinae. Image of Trichomonas vaginalis giant adhering amoeboid cell (phase contrast).
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Cell showing the four anterior flagella, the short undulating membrane, the nucleus, the parabasal apparatus and the axostyle.
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Cell stained by protargol, cell showing the four anterior flagella and the short undulating membrane and the subjacent costa.
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Cell showing the four anterior flagella, the short undulating membrane, the nucleus, the parabasal apparatus with the long parabasal fibre and the axostyle (protargol staining).
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Cell stained by protargol, showing the four anterior flagella, the short undulating membrane and the subjacent costa.
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Scanning electron micrograph showing anterior flagella and the recurrent flagellum adhering to the short lamellar undulating membrane.
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Adherent amoeboid cell by phase contrast microscopy.
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Division stages by immunofluorescence showing the two sets of flagella separated by a thick paradesmose.
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Division, by immunofluorescence, showing the two sets of flagella separated by a thick paradesmose.
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Centers for Disease Control/Division of Parasitic Diseases and Malaria
EOL staff
Life cycle of Trichomonas vaginalis, the cause of trichomoniasis in humansTrichomonas vaginalis resides in the female lower genital tract and the male urethra and prostate (1), where it replicates by binary fission (2). The parasite does not appear to have a cyst form, and does not survive well in the external environment. Trichomonas vaginalis is transmitted among humans, its only known host, primarily by sexual intercourse (3).From
Centers for Disease Control Parasites and Health website
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Description: English: Trichomonas vaginalis photographed by phase contrast microscopy. Date: 17 July 2010. Source: Own work. Author:
Dr Graham Beards.
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Description: English: Trichomonas vaginalis (arrows) from a vaginal swab stained by Gram's method. Date: 23 April 2021, 14:26:37. Source: Own work. Author:
Dr Graham Beards.
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Description: English: This photomicrograph of a wet-mounted vaginal discharge specimen, revealed numbers of Trichomonas vaginalis protozoan parasites, leading to a diagnosis of trichomoniasis, which is a very common sexually transmitted disease (STD) caused by the protozoan, T. vaginalis. Although symptoms of the disease vary, most women and men, who harbor the parasite, are unaware that they are infected. Date: 1975. Source:
https://phil.cdc.gov/Details.aspx?pid=14500. Author: CDC/ Joe Miller.