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At least 739 records · Page 41Linked to original sources
PubMed1975

Ecological comparative analysis of parasite fauna of Rutilus rutilus L. and Coregonus albula L. from waters of the European part of the Arctic Ocean Province.

The differences between the parasite fauna of Rutilus rutilus L. and Coregonus albula L. are caused by the fact that the former host is more warm-requiring and the conditions in waters of the Arctic Ocean Province of the Circumpolar Subregion are less favourable to it. On the other hand, C. Albula, which is a northern species, lives here under optimal conditions. R. rutilus is bentophytophagous and C. albula planktophagous species, which results in the differences in species composition of their parasites. Also differences in the growth and seasonal and annual changes of their parasite fauna have been observed.

Animals↗
PubMed1987

Eurytrema procyonis in a New York fox.

A fox infected with canine distemper virus had multiple Eurytrema procyonis trematodes within the major pancreatic duct. The ductal epithelium was slightly hyperplastic and there was mild periductal fibrosis present. There was dilatation of the pancreatic duct containing the parasites. Numerous eosinophilic intracytoplasmic inclusions were present in the epithelium of multiple organs, including the pancreatic ducts.

Animals↗
PubMed1993

DNA probes for the detection of Fasciola hepatica in snails.

Fasciola hepatica, also called the large liver fluke, is a trematode which can infect most mammals. Monitoring the infection rate of snails, which function as intermediate hosts and harbour larval stages of F. hepatica, is an important component of epidemiological studies on fascioliasis. For this purpose, DNA probes were generated which can be used for the detection of F. hepatica larvae in snails. Four highly repetitive DNA fragments were cloned in a plasmid vector and tested by Southern blot hybridization to the DNA of various trematodes for specificity and sensitivity. The probes Fhr-I, Fhr-II and Fhr-III hybridized only to F. hepatica DNA. Fhr-IV contained ribosomal RNA gene sequences and cross-hybridize with the DNA from various other trematode species. Squash blot analysis showed that the different probes were able to detect the parasite larvae in trematode-infected snails even as isolated single larvae. No signals were obtained in squash blots of uninfected snails. Probes Fhr-I, Fhr-II and Fhr-III are thus useful specific tools for studying the epidemiology of fascioliasis. The probe Fhr-IV, because of its broader spectrum, can be used to detect the larvae of a wide range of trematode species of waterbirds, which are the causative agents of swimmer's itch.

Animals↗
PubMed1994

[Problem of pathogenesis of somatic gigantism in snails infected with developmental stages of digenetic trematodes].

Mechanism of pathogenesis of somatic gigantism of water snails infected with development stages of digenetic trematodes is a complex phenomenon. The manner of origination of these abnormalities is often dependent on accepted host-parasite relationship. In the article there are discussed essential foundations of hypotheses explaining snails' parasitological gigantism as a consequence of alterations in gonadal activity (e.g. the hypothesis of disturbances in energetic budget of a host) or of different aspects of the parasite effect on activity of the neurosecretory centres, involved in the control of somatic growth, as well as a possibility of production by parthenites some compounds, acting synergically with host's growth neurohormone.

Animals↗
PubMed1988

Heterologous synergistic interactions in concurrent experimental infection in the mouse with Schistosoma mansoni, Echinostoma revolutum, Plasmodium yoelii, Babesia microti, and Trypanosoma brucei.

Primary infections with Plasmodium yoelii and Echinostoma revolutum in the mouse induced a significant increase in the heterologous Schistosoma mansoni challenge worm establishment, whereas S. mansoni worm establishment remained unaffected by primary infections with Trypanosoma brucei and Babesia microti. Concurrent infection in the mouse with P. yoelii or T. brucei, but not with B. microti, blocked the resistance to homologous E. revolutum challenge infection, and primary P. yoelii and T. brucei infections and corticosteroid treatment made naive, innately resistant mice susceptible to E. revolutum infection. Innate resistance to infection with E. revolutum, the pattern of expulsion of low-level E. revolutum infections, and resistance to homologous S. mansoni challenge infection remained unaffected by concurrent B. microti infection. Primary, heavy E. revolutum infections in the mouse resulted in the enhancement of subsequent infection with B. microti, whereas primary infection with S. mansoni suppressed subsequent B. microti infection in some but not all experiments. In a single experiment, P. yoelii infection was suppressed markedly by primary S. mansoni infection, whereas the enhancement of P. yoelii infection in concurrently E. revolutum-infected mice was seen in only one of the several experiments conducted. However, no interference with resistance to homologous B. microti and P. yoelii challenge infection was induced by concurrent infection with S. mansoni and E. revolutum. We suggest that the synergistic interactions demonstrated between protozoans and helminths in concurrent experimental infection in the mouse are induced by immunosuppression.

Adrenal Cortex Hormones↗
PubMed2003

The first human case in Mexico of conjunctivitis caused by the avian parasite, Philophthalmus lacrimosus.

Species of Philophthalmus parasitize primarily the eyes of wild and domestic birds. A variety of mammals, including humans, occasionally serve as the intermediate as well as the definitive hosts for this parasite, although human cases are extremely rare. Here, we report a case of human conjunctivitis caused by an infection with Philophthalmus sp. in Mexico. The patient was a 31-yr-old male who visited an ophthalmologist in Los Mochis, Sinaloa, Mexico, because of a foreign-body sensation in his left eye for 2 mo. A small live parasite was found in the connective tissue of the bulbar conjunctiva and was removed surgically under local anesthesia under ophthalmoscopic observation. The parasite was identified morphologically as Philophthalmus lacrimosus Braun, 1902. This is the first case of human philophthalmosis in Mexico and, to our knowledge, the first human case of P. lacrimosus infection in the world.

Adult↗