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At least 217 records · Page 12Linked to original sources
PubMed1999

[2-year retrospective study of 344 patients presenting for corneal lesion and who were examined for free amebas].

PURPOSE: The number of cases of amibian keratitis seems to have increased in the XV-XX hospital. Consequently, a study was carried out on 344 patients who came to be treated for keratitis or corneal ulcers over the last two years. METHODS: 28 patients out of 344 showed Acanthamoeba in lens storage cases and/or corneal scrapes. The diagnosis, treatment and clinical evolution of 28 patients were presented. RESULTS: 26/28 patients wore contact lenses, 22 lens cases examined out of 149 (15%) and 7 of corneal scrapes out of 344 (2%) showed the presence of Acanthamoeba. 68% of patients (19 out of 28) came to be treated for the first time in the emergency department. 2/28 patients (7%) were examined at the very beginning of the amibian infection and 24/28 patients (86%) showed the beginnings of stromal infiltration. The diagnosis for 13 of the patients was made within 15 days. 19/28 patients recovered, 1 patient had to undergo a penetrating keratoplasty, 4/28 patients had bacterial infections and 4/28 patients disappeared and we heard nothing more from them. CONCLUSION: Acanthamoeba were isolated from only 7 cornea, whereas 24 patients had an amibian infection. A deep corneal scrape is necessary to avoid a false negative result. A lens storage cases examination is highly recommended.

Acanthamoeba Keratitis↗
PubMed2001

[Chromosome-like bodies of dysentery ameba Entamoeba histolytica].

Intact and surface stretched amembraneous nuclei of Entamoeba histolytica (Rhizopoda, Lobosea, Entamoebidae) trophozoites were studied by light and electron microscopy. A moderately dense karyosome about 1.5 microns in diameter, localized in the central part of the interphase nucleus, contains the bulk of nuclear DNA. Within the karyosome, beaded and ribbon-like chromatin bodies surrounding a loose fibrillar core are commonly recognized. The peripheral domain of both interphase and several mitotic nuclei is filled with a heterogeneous material similar in its ultrastructure to the nucleolar substance. A wide fibrogranular domain lies between this unusual nucleolus and the karyosome. Rosette-like intranuclear inclusions 0.2-0.4 micron in diameter are often seen in both the fibrogranular and nucleolar domains. At the prophase-metaphase, nearly 50 linear chromosome-like bodies are detected as being in close association with several large beaded and ribbon-like chromatin bodies. At the anaphase-telophase, the chromatin bodies per surface-stretched daughter nucleus of live entamoebae, and in each amembraneous daughter nuclear preparation number nearly 14 and 6, respectively. Besides, in each amembraneous DAPI-stained nucleus a set of 50 or so linear chromosome-like bodies are clearly identified. We infer that the nucleus of E. histolytica contains more than 50 linear chromosomes which at different stages of the cell cycle can unite into several beaded and ribbon-like associations. These form a single moderately dense chromatin karyosome in the central part of the interphase nucleus.

Animals↗