[Possible influences of climatic changes on the spread and intensity of foci of some human helminthiases]. / Vozmozhnosti vliianiia izmeneniia klimaticheskikh pokazatelei na rasprostranenie i intensivnost' ochagov nekotorykh gel'mintozov cheloveka.

Climatic changes on the Earth and in some of its regions have caused and will cause alterations in the natural and social factors which may influence the circulation of causative agents of helminthiases that develop both on land and in water with the participation of hydrobiont. These include changes in the size of the first and second intermediate hosts, in the hydrological conditions of water reservoirs, in the amount of precipitation, soil moisture, heat, etc. Therefore, the expected global warming may alter the areas of some helminths, the intensity of foci, etc.

[An experimental study of the susceptibility of the snakehead Ophiocephalus argus to infestation by larvae of the tapeworm Diphyllobothrium latum]. / Eksperimental'noe izuchenie zarazhaemosti zmeegolova Ophiocephalus argus lichinkami lentetsa shirokogo Diphyllobothrium latum.

Experiments were made to infect young Ophiocephalus argus, the fish of prey delivered from eastern Asia in the Amu-Dar'ya River basin, outside the area of the broad tapeworm Diphyllobothrium latum. The dalags were infected mainly by ingesting the local copepods Arctodiaptomus salinus, the experimentally invaded larvae of the broad tapeworm. The latter larvae were obtained from the development of eggs of the helminth isolated from strobilae from the patients treated in Perm Province. D. latum plerocercoids lived in the dalags nearly 3 weeks, then they died and lysed. Thus, the dalag cannot be a supplementary host of D. latum.

[Helminthiasis morbidity in an organized pediatric population in one of the regions of the Far North]. / Porazhennost' gel'mintozami organizovannogo detskogo naseleniia v odnom iz raionov Krainego Severa.

In 1991-1992, higher affection rates of diphyllobothriasis and enterobiasis were notified in some groups of the organized children living on the Pur River (the Yamalo-Nenets Autonomous Okrug). The children are infected by Diphyllobothrium in infancy, the risk of infection is rather high, reinfections are observed. Among other things, this makes it necessary to perform systematic educational studies among the population in their different forms.

[The characteristics of diphyllobothriasis foci in the Pur River basin (Yamalo-Nenets Autonomous Okrug)]. / Osobennosti ochagov difillobotriozov v basseine reki Pur (Iamalo-Nenetskii avtonomnyi okrug).

Diphyllobothriases are spread in the population of the Pur River basin unevenly. The population on the lower Pur is affected little, but that on the upper Pur and its tributaries is affected much more. This is largely accounted for by what fishes are prevalent in the diet of the local population and how they consume fish. In the past 30 years, the infection of fish with Diphyllobothrium latum larvae and the prevalence of the population's infection have reduced in some areas of the Pur River basin. Among other things, this is associated with man-made impacts on the local water reservoirs (development of areas, gas extraction, etc.), which influences the first and second intermediate D.latum hosts.

[The spread of the principal socially important parasitic disease on the territory of the Chukot Autonomous Okrug (ChAO)]. / O rasprostranenii osnovnykh sotsial'no znachimykh parazitarnykh boleznei na territorii Chukotskogo Avtonomnogo Okruga (ChAO).

The paper provides the examination findings of helminthiases in the population of the town of Anadyr, the settlements of Kanchalan, Krasneno, and in the reindeer-breeding teams of the Anadyr District, CAD. The children infected with enterobiasis were shown to amount to 15.1 to 22.9%, diphyllobothriasis was detected in 12.9 - 33.7% of the examinees. Single cases of ascariasis were revealed. Analysis of 232 cases with echinococcosis demonstrates that the infection is prevalent over the whole Chukotka territory. Infection with Echinococcus multilocularis is more common in the indigenous population in the north-east of the District and that with Echinococcus granulosus in the central and northern regions. High extensive and intensive parasitic contamination rates of environmental objects, such as soil, sewage, household appliances, fish, etc., were noted, indicating a constant risk for Chukotka population's infection with parasites.

[The effect of economic activities altering water resources on the parasitological situation]. / Vliianie khoziaistvennoi deiatel'nosti, izmeniaiushchei vodnye resursy, na parazitologicheskuiu situatsiiu.

The possibilities and results of impact of some economic activities of man, which alter the hydrological regimen of reservoirs and territory irrigation on the parasitological situation in their area are outlined in the paper. It shows that in some cases economic activities favour the spread and incidence of diseases and in other cases they may lead to a reduction in the rate of infection, make the focus extinct.

[The morphology of the causative agent of human diphyllobothriasis in the Far East]. / Morfologiia vozbuditelia difillobotrioza cheloveka na Dal'nem Vostoke.

The morphology of types F, A, C plerocercoids, and mature Diphyllobothriidae of the Far Eastern populations (USSR) was studied by using scanning electron microscopy. New data were obtained on structure the skin muscular sac of plerocercoids type F (presence of tegumental microvilli, multi poly-layer of longitudinal subtegumental musculature, and variation of quantity of muscular filaments along strobila. The morphological identity of mature Diphyllobothriidae from the volunteer (self-infection of plerocercoid "type F"), infested men and seagulls from focuses of diphyllobothriasis in the Pacific Ocean regions in the Far East of the USSR was proved.

[Fishes in the lower reaches of the Ob River studied for their infectiousness with helminth larvae of medical significance]. / Issledovanie ryb v nizov'e Obi na zarazhennost' lichnikami gel'mintov, imeiushchikh meditsinskoe znachenie.

The data on fish infection with Diphyllobothrium and Opisthorchis larvae in the lower Ob were specified. There is a tendency to decrease fish infection with Diphyllobothrium plerocercoids and preserve infection with Opisthorchis metacercariae.