Eustrongylides spp. are nematodes from the Dioctophymatidae family, potentially dangerous for the health of mammals. The aim of this review is to describe the distribution of the Eustrongylides spp. nematode. Eustrongylidosis is a parasitic disease which is common in countries with a continental, tropical or subtropical climate. Eustrongylides are biohelminths with a complicated development cycle. The nematode development takes place in the aquatic environment and includes a wide range of intermediate, definitive, and accidental hosts. The purpose of this review is describe the distribution of Eustrongylides spp. nematodes in the global regions, describe the prevalence of infection in those regions, and identify intermediate, definitive, and accidental hosts. It was found that Eustrongylides spp. nematrodes are significantly widespread around the world. In part in North America the agent of eustrongylidosis is registered mostly among birds and fishes, but cases of humans being affected with the disease are noted as well. In South America the given disease was also registered among amphibians and reptiles. In Europe, Asia, Africa, Oceania and countries of the Far East, the disease is registered mostly in fishes, rarely – in birds. The taxonomic identification showed that some nematode species were related to certain geographic areas. For example, Eustrongylides ignotus and Eu. tubifex were mostly registered in North America, while for Europe (including Ukraine), Near and Middle East, Eu. еxcisus is a dominant species. Analysis of scientific sources showed that continents with warmer climatic conditions (South America, Asia, etc.) are characterized with a wider range of fishes, birds and reptiles which can potentially serve as hosts for the Eustrongylides nematodes.
Ten laboratory rats were experimentally invaded per os with the Eustrongylides excisus (Jäegerskiold, 1909) nematode larvae (L3–L4) received from Perca fluviatialis (Linnaeus, 1758), caught in the water area of the Dnipro-Buh Estuary, Ukraine. The aim of the experimental study was to measure the pathogenic effect of the given parasite on the mammals’ organisms by means of the histological analysis of the affected organs of the infected rats. The researched animals were divided into two groups. The experiment lasted 15 days; the second group was a control group. The histological analysis showed purulent-serous and purulent-fibrinous peritonitis, acute circulatory disorders in brain tissues (signs of hypoxic-ischemic lesions of the brainstem in the form of neuronal changes) and the heart (partial spasm of arteries and edema of interstitial myocardial tissue); pathological changes in the lungs (acute interstitial purulent pneumonia, acute focal emphysema of the lungs), liver (acute exudative hepatitis), kidneys (signs of shock reaction) and intestines (acute serous-purulent enteritis). Formation of non-specific granulomas was noticed, which contained the fragments of the parasitic larvae. The acute course of the purulent-serous and purulent-fibrinous inflammatory processes in the organs of the invaded rats was noticed; signs of systemic inflammatory response syndrome with pronounced distributive vascular leukocytosis in the studied organs.
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