ingestion of infective metacercariae, attached to watercress or other various species of water and terrestrial plants, has been implicated as the main source of human contamination by fasciolid flukes. presence of several species of aromatic wild grown plants, which are eaten fresh on the table or used for preparation of some plant-made foods (delar, mixture of salt and ground local plants, as ...

Juga yrekaensis freshwater snails were tested for trematode stages and for Ehrlichia risticii DNA using a nested PCR assay. Snails were collected monthly from two Potomac horse fever (PHF) endemic locations in northern California (Montague and Weed). The trematode infection rate varied between 40 and 93.3% in large snails (shell size >15mm) and between 0 and 13.3% in small snails (<15mm). The h...

Geographic variability in abundance can be driven by multiple physical and biological factors operating at multiple scales. To understand the determinants of larval trematode prevalence within populations of the marine snail host Littorina littorea, we quantified many physical and biological variables at 28 New England intertidal sites. A hierarchical, mixed-effects model identified the abundan...

Little is known about the patterns of variation in parasitism in marine hosts. Trematodes, the dominant parasites in intertidal systems, are transmitted from their first intermediate hosts (snails) to a range of second intermediate hosts, including crustaceans. Using published studies of trematode infections in crustacean hosts, we investigated general patterns of variation in trematode species...

The genetic diversity of trematodes within second intermediate hosts has important implications for the evolution of trematode populations as these hosts are utilized after the parasites reproduce asexually within first intermediate hosts and before sexual reproduction within definitive hosts. We characterised the genetic clonal diversity of the marine trematode Maritrema novaezealandensis with...

Infection by trematode parthenitae (larval, asexual trematodes) has severe consequences for molluscan hosts, resulting in cessation of reproduction and early mortality. Here we present evidence that the freshwater snail Planorbella trivolvis can lose infections by trematode parthenitae. Of 8 P. trivolvis infected by reniferin parthenitae, 6 died within 2 wk, whereas the remaining 2 snails lost ...

Trematodes have complex life cycles with infective stages in multiple hosts including species of conservation concern. We conducted a field survey of seven ponds in Teton County, Wyoming for trematode prevalence and richness. We collected snails from each location and determined trematode prevalence by shedding snails and determined trematode richness by dissection of infected snails. At each l...

Abstract Copepods of the genera Calanus and Pseudocalanus are important components Arctic marine ecosystems. Despite key roles these zooplankters, little is known about organisms they interact with most intimately, their parasites symbionts. We applied metabarcode sequencing to uncover eukaryotic present within two copepod from three areas around high archipelago Svalbard. Ten distinct parasite...

BACKGROUND Since free radical scavengers of parasite origin like glutathione-S-transferase and superoxide dismutase are being explored as prospective vaccine targets, availability of these molecules within the parasite infecting different hosts as well as different sites of infection is of considerable importance. Using Clinostomum complanatum, as a model helminth parasite, we analysed the effe...