Contamination of ordinary fox (Vulpes vulpes) by Trichinella spiralis spp. infection, the Ryazan region extracted in 6 areas, makes 21,22 %. Intensity of infection is 5,2–11,7 larvae in one g of ikronozhny group of muscles. Index of abundance – 8005,6 larvae. 2910 foxes are annually extracted by hunters.

It is established high infection of fishes by Opisthorchis felineus and diseases of the population with opisthorchosis in the West of Kazakhstan.

The fauna of parasitic worms in two species of marine birds – northern fulmars (Fulmarus glacialis) and kittiwakes (Rissa tridactyla) – from northern and western areas of offshore water of the Barents Sea is studied. Helminth fauna of these birds are characterized by insignificant species diversity and high values of intensity of infection. The most successful in biocenoses of the Barents Sea are realized life cycles of the helminths which include one or more paratenic hosts – nematodes from families Anisakidae and Streptocaridae and cestodes from the family Tetrabothriidae. It is shown influence of anthropogenic factor on the circulation of parasites in the region. Discharge of waste fishing contains a large number of helminth’s larva and actively used in the food by seabirds.

The infeсtion of biohelminths of fishes in Sevan Lake is studied. 9 types of biohelminths are revealed: in a body cavity, intestines, heart and crystalline lenses of eyes. The analysis of changes of specific composition of the helminths in dynamics, taking into account changes of fauna of their intermediate hosts, in conditions of hydroecological transformations of the lake is conducted.

The helminthofauna of Rana arvalis Nilsson, 1842 in Republic of Mordovia is studied. It is revealed 23 species of helminths: Trematoda – 18 and Nematoda – 5. Dominating by quantity of types mature and larvae the Trematoda are characterized by low indicators of contamination and treat rare parasites of this host. Background parasites with high degree of the infection are geonematodes Rhabdias bufonis and Oswaldocruzia filiformis. They meet at Rana arvalis in all territory of the region; are less often distributed Cosmocerca ornata and Haplometra cylindracea. Distinctions in separate populations of amphibians are defined by different structure of trematodes and depend from character of a biotope.

Neurotransmitters serotonin and neuropeptide FMRFamide were visualised by immunocytochemically in the nervous system of two cercariae – Metorchis bilis (Opisthorchidae) and Sanguinicola armata (Sanguinicolidae). The investigated compounds were demonstrated in the central and peripheral nervous system of cercariae. The obtained results and literature data on the presence and distribution of the studied neurotransmitters in different representatives of cercariae are analyzed.

Dates on dynamics, number, structure of the population, quantitative structure of wolfs family, spectrum of feed, fruitfulness, helminthofauna of wolfs in territory of Ivanovo area during 1995–2011 are given.

The evaluation of the degree of helminthosis in Losinyi ostrov was made by monitoring of biocenosis conditions, population of intermediate and definitive hosts and its contamination. Different lands of Losinyi ostrov have different conditions for development of many species of helminths. Ecology and adaptive mechanisms of helminths are important in its surviving in the environment and getting into a host body.

Trematodes from 11 families have dixenic life cycles. Primary dixenic life cycles are typical for trematodes families Notocotylidae and Psilostomidae. Secondary dixenic life cycles have 3 versions. Trematodes from families Sanguinicolidae and Schistosomatidae develop only in the 1-st version of the secondary dixenic life cycles. The 2-nd version of the secondary dixenic life cycles typical for trematodes Cyclocoelidae, Lecithodendriidae, Microphallidae and for trematodes of 4 families (Monorchidae, Cyathocotylidae; Echinostomatidae; Opecoelidae) only in bad conditions. Sometimes several trematodes of Monorchidae develop in the 3-rd version of the secondary dixenic life cycles.

Logical-information modeling is not fully being implemented for the prediction of possible violations of the living ecosystems. Between individual species in ecosystem relationships are possible «parasite-host». The proposed algorithms canbe used to create models of complex natural and ecological systems – bird’s symbiocenosis. Based on available data, attempts to use these algorithms for multisymbiocenosis birds.

It is revealed 2 species of protozoa and 7 species of helminths including 1 specie of trematodes, 2 – cestodes, 4 – nematodes at hens in Chechen Republic. The territory of settlements, farmstead economy are contaminated by eggs and larvae of helminths and oocysts, sporocysts and cysts of protozoa.

The epizootic situation at cryptosporidiosis in the newborn calves are studied. The calves at the age of 15 days in Dagestan are infected by Cryptosporidium spp. at 45,3 %. Direct dependence of calves infection of kolostral immunity is shown. The calves infection raised with fall of level of immunoglobulines in blood serum.

Long-term monitoring and literary data on the effect of wild ungulate acclimatization and introduction on territory helminth fauna complex are reviewed. It is shown that in several cases introduced wild ungulates may lose their specific parasites and aquire indigenous ones thus maintaining foci of native parasitic diseases. Brought with introduced animals new parasites colonize new hosts and inflict significant losses to game management.

Buffaloes in Kabardino-Balkarian Republic are infected with Echinococcus granulosus at 16,7 % at intensity of infection 2–17 sp. Diameter of E. granulosus larvocysts in adult buffaloes is 3–14 sm and the cavity of bubbles is filled with a transparent liquid. Echinococcosis in buffaloes in this region proceeds with scope of an adult livestock.

It’s determinate that a new combination anthelmintic aversect plus at dose levels 0,5 mg/kg and 5 mg/kg of body weight according to aversect-3 and praziquantel, don’t show negative effects on blood and no specific resistance of dogs.

The results of the analysis of serums blood of sheep immunized twice intramuscularly by excretes and secrets of cultivated cages of Coenurus cerebralis protoscolex (a cellular antigene), immunoenzyme reaction of ELISA are given. High antigene activity of a cellular antigene is established. Optical density (OD) parameters in ELISA of serums of immunized sheep during experiment (110 days) on the average on group made 2,339 that above those before immunization (0,314) by 7,45 times. The parameters of OD in control group were on the average 0,201–0,251.

The cases of dirofilariosis of carnivorous were registered in Yakutsk (D. repens and D. immitis). A new method of isolation of filarial larvae was developed.

The efficiency of various forms of albendazole prepared on mechanochemical technologies with use of address delivery DDS (Drug Delivery System) is tested on white mice experimentally infected with Trichinella spiralis in a doze of 250 larvae and Hymenolepis nana in a doze of 200 eggs. The form № 2 in a doze of 10 mg/kg has shown 100% efficiency against T. spiralis and H. nana. Albendazole in the same doze has shown respectively 73,1 and 10,1% effect.

Subacute toxicity of salt briquettes with ivermeсtin is studied. The drug has no influence on hematologic and biochemical parameters, doesn't cause pathological changes in tissues and bodies. The body weight and weight of internal organs of rats were as in control groups. The preparation doesn't have cumulative action.

Prazifen in a dose of 1,0/10,0 and 3,0/30,0 mg/kg DV respectively on praziquantel and fenbendazole at introduction in stomach during the various periods of embryogenesis didn't show embryotoxic and teratogenic action.

The terms of elimination of fenbendazole from horses body after prazifen treatment were established by the method of highly effective liquid chromatography. In 10 days after treatment fenbendazole and its metabolite oxfendazole were not found in horses' organism.

The species structure, morphological peculiarities and economic importance of the dominant cyst nematodes from cultural and natural phytocenosis of Ukraine are analyzed.

In 2010–2011, in field conditions (Smolyan potato growing region) microplots experiment have been carried out to determine the effect of population densities of Globodera rostochiensis pathotyp 3 (Ro3) on the growth and yield of two new Bulgarian potato (Solanium tuberosum L.) varieties Evridika and Orfei. Microplots were 25 cm-diam, 30 cm-deep, filled with 10 L of soil infested with G. rostochiensis in a geometric series of nematode densities between 0 and 64 eggs/mL of soil. Eight weeks after planting in infested soil, the relative plant height of varieties Evridika and Orfei was reduced at Pi ≥ 1 and 32 eggs/mL soil, respectively. In both potato varieties the minimum possible relative values for plant height were 0,51 and 1,0, respectively, at Pi = 64 eggs/mL soil. The tolerance limits of potato yield of Evri-dika and Orfei were 2 and 16 eggs/mL soil, respectively. The minimum possible relative values for yield of Evridika and Orfei were 0,325 kg/plant and 0,659 kg/plant, respec-tively, at Pi = 64 eggs/mL soil. A mathematical model describing the influence of Pi of G. rostochiensis and yield of both varieties can be used in expert advisory systems when accounting for the environmental factors.