Intestinal protozoa

A wide range of intestinal protozoa infections was detected among indigenous ethnic minorities and local Russians (settlers) living in the northern territories for generations. Prevalence of different intestinal protozoa revealed by examination of onetime collected faeces without any concentration techniques, fluctuated from 26 to 94% (Sorochenko 1968). The frequency of a detection of cysts and trophozoites of Entamoeba histolytica in healthy subjects in the Arkhangelsk region was not changed between the 1930s and the 1960s. Reported prevalence was from 6 to 10% (Epstein 1932; Sorochenko 1966). The spectrum of other intestinal protozoa detected among aboriginals and local Russians includes: E. hartmanny (prevalence fluctuated from 1 to 35%), E. coli (9-32%), Endolimax nana (5-34%), Giardia lamblia (9-28%), Blastocystis hominis (16-24%), Iodamoeba butchlii (4-15%), and Chilomastix mesnili (2-11%). Prevalence of G. lamblia in children was constantly higher than in adults. There was no gender difference in prevalence of intestinal protozoa. A higher prevalence sometimes among Russians or in aboriginals was detected in different surveys (Epstein and Zertchaninov 1932; Sorochenko 1966, 1968; Khudoshin 1968). Giardiasis contracted in Leningrad was reported in tourist groups from the USA (Centre for Disease Control 1986) and Finland (Jokipii et al. 1985). Three hundred and seventy three children under 7 years of age were examined for Cryptosporidium oocysts in the hospital of St Petersburg. The oocysts were revealed in 10 (2.7%) children. The infection manifested by fever, abdominal pains, and diarrhoea in two of them (Beyer et al. 1990).

Information on the prevalence of intestinal protozoa among inhabitants of the northern territories of Russia is extremely rare. Intestinal protozooses are not included in the list of notifiable diseases. Only giardiasis has been included recently. That is why general practitioners are not familiar with these infections. Fragmentary data presented above are results of occasional surveys that been carried out by solitary researchers.

0 0

Post a comment