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Results for “TREMATODE INFECTIONS”

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At least 937 records · Page 52Linked to original sources
PubMed2005

Multi-species interactions among a commensal (Chaetogaster limnaei limnaei), a parasite (Schistosoma mansoni), and an aquatic snail host (Biomphalaria glabrata).

This study assessed the effects of a commensal, Chaetogaster limnaei limnaei, and a parasitic trematode, Schistosoma mansoni, on infection patterns and life-history responses in the aquatic snail Biomphalaria glabrata. Prevalence of infection was significantly higher in snails that were devoid of C. limnaei limnaei relative to those that were colonized by the commensal, indicating that the oligochaete may protect the host from trematode infection. This finding appeared to be the direct result of the commensal as opposed to indirect stimulation of the immune system, as hemocyte numbers did not differ between C. limnaei limnaei-colonized and noncolonized snails. Snail growth and reproduction were affected by the presence of C. limnaei limnaei and exposure to S. mansoni. Two-way ANOVA revealed a significant effect of both C. limnaei limnaei presence and trematode exposure on B. glabrata growth over the 5-wk study with C. limnaei limnaei-colonized and parasite-infected snails demonstrating the greatest growth. Snails exposed, but uninfected, by S. mansoni demonstrated the lowest growth regardless of commensal colonization. Chaetogaster limnaei limnaei colonization had no effect on egg production, but S. mansoni-infected snails produced significantly more eggs than individuals from other treatment groups. Survival remained over 85% in all treatment groups. The ecological implications of these results are discussed.

Analysis of Variance↗
PubMed1990

Introduction of a Brachylaima species (Digenea: Brachylaimidae) to Australia.

A Brachylaima species recorded previously from the house mouse (Mus domesticus) in South Australia is shown to use the introduced European snails Cernuella virgata and Cochlicella barbara as first intermediate hosts, and the same two species and Theba pisana as second intermediate hosts. The life cycle is typical of Brachylaima species. The parasite is capable of infecting at least two species of native Australian rodent, Rattus fuscipes and Leporillus conditor. Because of the intermediate hosts used, it is hypothesized that this trematode species has been introduced from Europe. The parasite may be conspecific with one of a number of described European species but difficulties with the literature concerning these species have required that the present form be designated only as Brachylaima sp.

Animals↗
PubMed2001

[Pleural effusion and eosinophilia associated with Metagonimus yokogawai infection].

We encountered a patient with a mild fever and chest discomfort in whom right pleural effusion and eosinophilia (48%) had developed. Parasite eggs were found in the feces, and metagonimiasis was diagnosed. The pleural fluid contained many Charcot-Leyden crystals, suggesting active eosinophilic inflammation. Metagonimus yokogawai usually occurs as a gastrointestinal parasite and causes only mild gastrointestinal symptoms such as diarrhea. Most cases of metagonimiasis resolve spontaneously. However, the main manifestation of metagonimiasis in our patient was pleural effusion. Some cases of idiopathic eosinophilic pleural effusion of unknown origin resolve spontaneously, as in our patient. Patients who are therefore considered to have idiopathic pleural effusion may include those with transient parasitic infection.

Adult↗