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The ticks Ixodes persulcatus and I. pavlovskyi collected from people visited gardens and suburban forests have been examined by the IFA methods on the presence of tick-borne encephalitis virus (TEV). It was established, that the most part of ticks collected from humans belongs to I. persulcatus, despite the fact that I. pavlovskyi dominates on the territory of the city and its suburbs. TEV infection was registered more often in fed ticks, in comparison with those without signs of preceding feeding. Infected specimens constituted 9.4 % of 53 I. persulcatus individuals examined. In I. pavlovskyi 3.1 % of 27 examined specimens were infected. In fed ticks (41 specimens of I. persulcatus and 20 I. pavlovskyi) the rates of infected specimens were higher and constituted 48.8 and 35 %, respectively. In suburban forests, as well as in the city, I. persulcatus was found to attack humans more often than I. pavlovskyi. TEV infection was recorded in 12.7 % of 220 unfed I. persulcatus specimens examined and in 41.6 % of 142 fed individuals. In I. pavlovskyi, 6.6 % of unfed and 25 % of fed specimens was infected (33 unfed and 24 fed specimens were examined). Thus, in all territories examined, percent of infected specimens was significantly lower in I. pavlovskyi, and in fed ticks of both species, TEV was recorded more often.

First description of the previously unknown Prosimulium candicans males is given. Belonging of this species to the genus Prosimulium Roubaud, 1906 rather than to the genus Taeniopterna Enderlein, 1925 is confirmed.

Variability of absolute fecundity of nematode Thominx neopulchra from three species of genus Myotis was studies on the territory Zhiguli State Reserve in 2007, 2008. Significant differences in the fecundity of the nematode females depending on host species and sex, size of the parasite, number of the helminthes in a given host, and season of year were revealed.

Data on the parasite diversity in Salmonidae fish parr from different parts of the Utsjoki River obtained during 1993-1995 and 2006-2007 are presented. Three fish species, Salmo salar L., S. truttae L., and Salvelinus alpinus L., were examined on the presence of helminthes. Twenty species of salmon parasites were found, the majority of which are the parasites with complicated life cycles. Infusorians Capriniana piscium, myxosporidia Chloromyxum januaricus and Myxobolus neurobius, metacercaria of the genera Diplostomum and Apatemon, and the nematode Raphidascaris acus larvae were the most numerous in salmon parasite fauna. Brown trout had the most number of specific parasite species, whereas char was infested by protozoan parasites only.

Two closely related forms of virgulate cercaria, Cercaria agstaphensis 9 and C. agstaphensis 10 of the superfamily Lecithodendroidea from water bodies of Azerbaijan are described. Morphological data, including chaetotaxic traits, fugures, and differential diagnoses are provided. Descriptions of armature, glandular apparatus, excretory and digestive systems, inclusions of parenchyma, and other structures of the cercaria, characteristic for the superfamily, are presented.

Infestation of zope Abramis ballerus with Dactylogyrus chranilowi Bychowsky, 1931 depending on the bactericidal activity of the host's blood serum was investigated. Connection of the infestation intensity with the level of antimicrobial effect of the host's blood serum is demonstrated.

Trematoda Artyfechinostomum sufratyfex Lane, 1915 was found in different mammal species of Southern Vietnam. Original measurements of this species from domestic pig, black rat, and Asian palm civet are given.

The paper describes the techniques of the actinospores investigation under field and laboratory conditions. The methylene blue solution for staining of actinospore processes and estimating of daughter cells of sporoplasm is proposed.

Formalin fixation is proved to be the useful tool in the method of age estimation for the taiga ticks collected in field. Formalin does not deform fixed material and does not dissolve fat; hence, it is the best fixing fluid when tick age is estimated by the state of fat reserves in its organism. The ticks preserved in 9 % formalin were shown to be suitable for age estimation 1.5—2 months after fixation.

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