General Parasitology and Protozoa
Laboratory diagnosis of vaginal trichomo-niasis is most commonly made by: (AIIMS Nov 2010)
|A||Identifying cyst stages in an iodine stained preparation of vaginal secretion.|
|B||Finding trophozoites in a saline wet mount of vaginal discharge.|
|C||Using an acid-fast stain to highlight the parasite.|
|D||Staining a thin blood smear with common blood stains.|
Trophozoites are usually visible in saline mounts of vaginal scrapings.
Cysts (A) are not present in the T. Vaginalis life cycle, and iodine is used primarily to observe cysts of intestinal protozoa. Acid-fast stains (D) are used to search for oocysts of coccidian intestinal parasites, such as Cryptosporidium and Cyclospora. Thin blood smears are used to diagnose malaria