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PubMedDate not supplied

[Blastocystosis and other intestinal protozoan infections in human riverside communities of the Valdivia River basin, Chile].

Between March and October 1987, the prevalence of infection by Blastocystis hominis and other intestinal protozoan, their relationship with the age and sex of the hosts, and the percentage of infected persons in family groups were determined in riverside communities of Valdivia River Basin, Chile. One or more intestinal protozoan species were determined in 72.5% of the examined persons. The prevalence was greater for B. hominis (61.8%). The prevalences of B. hominis, Endolimax nana and Entamoeba coli were greater in relation to the age of the host. The sex of the host and prevalence of infections by B. hominis and other species of intestinal protozoans did not show association. Prevalence of B. hominis was greater in persons from houses with no sanitary faeces disposal. Over 60% of the members of family groups showed infection by B. hominis in 53.1% of the groups compared to 2.4%-21.8% of infections by other protozoan species. Faecal samples of 45 pigs revealed 22.2% of infection by Blastocystis.

Adolescent↗
PubMed1982

Dientamoeba fragilis: a gastrointestinal protozoan infection in adults.

Dientamoeba fragilis is a protozoan parasite of the large intestine of man. Individuals with infection may be asymptomatic or have gastrointestinal and systemic symptoms. We report a patient with symptomatic D. fragilis infection and negative extensive laboratory and radiological workup, with resolution of symptoms after diiodohydroxyquin therapy. No parasites were detected in three follow-up stool examinations. We then undertook retrospective study to define and describe further clinical symptoms in adults with this infection by analysis of data from medical records of 50 subjects with this parasite.

Abdomen↗
PubMed1997

Role of natural killer cells in innate resistance to protozoan infections.

Natural killer cells are now recognized as major effectors of innate resistance to protozoan parasites. The principal mechanism by which they control the growth of these pathogens is indirect, involving cytokine production rather than cytolytic activity. Recent studies have identified a series of positive and negative signals provided by cytokines and cellular interactions which regulate protozoa-induced natural killer cell function.

Animals↗