scholarly journals Distribution of cysts holding Ascocotyle (Phagicola) longa metacercariae in tissues and organs of mugilid

2021 ◽  
Vol 30 (4) ◽  
Author(s):  
Juliano Santos Gueretz ◽  
Maiara Boeing ◽  
Juliana Murasaki ◽  
Elizabeth Schwegler ◽  
Anderson Barbosa de Moura ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Intermediate Host ◽  
Geographical Distribution ◽  
Human Infection ◽  
Intermediate Hosts ◽  
Wide Geographical Distribution ◽  
Fish Samples ◽  
Second Intermediate Host ◽  
Predatory Birds ◽  
Muscular Tissues

Abstract Ascocotyle (Phagicola) longa is an etiological agent of human phagicolosis. Mugilids are the second intermediate host, the first being Heleobia australis, and mugilids predatory birds and mammals are its definitive hosts. The occurrence of cysts holding A. longa metacercariae is described in mugilids with a prevalence of up to 100%. The wide geographical distribution of A. longa and its intermediate hosts coupled with the rise in the consumption of raw or poorly cooked fish may elevate the risk of human infection. Therefore, in this study, we aimed to verify the distribution pattern of cysts holding A. longa in mugilids. The tissue and organ samples of these fish were processed in a domestic blender and examined under a stereoscopic microscope to identify the cysts holding the digenetic metacercariae. Of the 24 (100%) fish samples that were analyzed, 12 of Mugil curema and 12 of Mugil liza possessed cysts holding A. longa metacercariae. Digenetic cysts were identified to be present in the gills, heart, stomach, liver, intestines, mesentery, and muscular tissues collected from M. curema and M. liza. Conclusively, in M. curema, the cysts holding A. longa metacercariae were found to be distributed randomly throughout the fish body in almost every tissue and organ that was examined.

The influence of second intermediate host species on the infectivity of metacercarial cysts of Echinoparyphium recurvatum

1999 ◽  
Vol 73 (2) ◽  
pp. 143-145 ◽  
Author(s):  
A.M. McCarthy
Keyword(s):  
Intermediate Host ◽  
Definitive Host ◽  
Host Species ◽  
Post Infection ◽  
Rana Temporaria ◽  
Biomphalaria Glabrata ◽  
Reproductive Status ◽  
Intermediate Hosts ◽  
Potential Influence ◽  
Second Intermediate Host

The potential influence of second intermediate host species on the infectivity of metacercarial cysts of Echinoparyphium recurvatum to the definitive host Anas platyrhynchos was examined experimentally. Echinoparyphium recurvatum metacercarial cysts were obtained from the following experimentally infected second intermediate hosts 14 days post expsoure to cercariae: Lymnaea peregra; Physa fontinalis; L. stagnalis;Planorbis planorbis; Biomphalaria glabrata; tadpoles of the amphibian Rana temporaria. Metacercarial cysts from each of these hosts were fed, in doses of 50 cysts per individual, to separate groups composed of between four and eight, 3-day-old A. platyrhynchos ducklings. All A. platyrhynchos were necropsied 15 days post-infection and the number, size, and reproductive status of E. recurvatum worms in the intestine was recorded. Analyses of variance on the number (transformed log (x + 1)) and size of worms revealed no significant differences in worms originating from metacercariae formed in the different second intermediate hosts (worm number P > 0.05, and worm size P > 0.05). All worms recovered were found to be gravid. It is therefore concluded that the species of second intermediate host utilized does not influence the infectivity of the metacercarial cyst of E. recurvatum, nor the subsequent establishment and reproductive status of the parasite in A. platyrhynchos.

Life cycles of species of Proteocephalus, parasites of fishes in the Palearctic Region: a review

1999 ◽  
Vol 73 (1) ◽  
pp. 1-19 ◽  
Author(s):  
T. Scholz
Keyword(s):  
Intermediate Host ◽  
Body Cavity ◽  
Life Cycles ◽  
The Body ◽  
Individual Species ◽  
Intermediate Hosts ◽  
Palearctic Region ◽  
Second Intermediate Host ◽  
Planktonic Crustaceans ◽  
Fish Hosts

The life cycles of species of Proteocephalus Weinland, 1858 (Cestoda: Proteocephalidea) parasitizing fishes in the Palearctic Region are reviewed on the basis of literary data and personal experimental observations, with special attention being paid to the development within the intermediate and definitive hosts. Planktonic crustaceans, diaptomid or cyclopid copepods (Copepoda), serve as the only intermediate hosts of all Proteocephalus species considered. A metacestode, or procercoid, develops in the body cavity of these planktonic crustaceans and the definitive host, a fish, becomes infected directly after consuming them. No previous reports of the parenteral location of metacestodes within the second intermediate host as it is in the Nearctic species P. ambloplitis have been recorded. Thus, the life cycles of Proteocephalus tapeworms resemble in their general patterns those of some pseudophyllidean cestodes such as Eubothrium or Bothriocephalus, differing from the latter in the presence of a floating eggs instead of possessing an operculate egg from which a ciliated, freely swimming larva, a coracidium, is liberated. The scolex of Proteocephalus is already formed at the stage of the procercoid within the copepod intermediate host; in this feature, proteocephalideans resemble caryophyllidean rather than pseudophyllidean cestodes. The morphology of procercoids of individual species is described with respect to the possibility of their differentiation and data on the spectrum of intermediate hosts are summarized. Procercoids of most taxa have a cercomer, which does not contain embryonic hooks in contrast to most pseudophyllidean cestodes. The role of invertebrates (alder-fly larvae — Megaloptera) and small prey fishes feeding upon plankton in the transmission of Proteocephalus tapeworms still remains unclear but these hosts are likely to occur in the life cycle. Data on the establishment of procercoids in definitive hosts, morphogenesis of tapeworms within fish hosts, and the length of the prepatent period are still scarce and new observations are needed. Whereas extensive information exists on the development of P. longicollis (syns. P. exiguus and P. neglectus), almost no data are available on the ontogeny of other taxa, in particular those occurring in brackish waters (P. gobiorum, P. tetrastomus). The morphology of P. cernuae and P. osculatus procercoids from experimentally infected intermediate hosts is described for the first time.

Evidence for specificity of Steganoderma formosum for its second intermediate host in the Northwest Atlantic

1996 ◽  
Vol 70 (3) ◽  
pp. 215-218 ◽  
Author(s):  
D.J. Marcogliese
Keyword(s):  
Intermediate Host ◽  
Hermit Crabs ◽  
Georges Bank ◽  
Intermediate Hosts ◽  
Scotian Shelf ◽  
Northwest Atlantic ◽  
The Pacific ◽  
Cephalothorax Length ◽  
Second Intermediate Host ◽  
Crangon Septemspinosa

AbstractMetacercariae of Steganoderma formosum Stafford, 1904 infected 17 of 358 Acadian hermit crabs (Pagurus acadianus) on the Scotian Shelf east of Nova Scotia, Canada, in the Northwest Atlantic Ocean in 1989, 1990 and 1995. Overall prevalence and abundance in P. acadianus on the Scotian Shelf were 5% and 0.4 metacercariae per crab, with a maximum intensity of 56. The highest prevalence (34%) and abundance (2.9) were recorded in the winter of 1989. All infected hermit crabs were greater than 9 mm in cephalothorax length. The parasite was not found in Acadian hermit crabs (n = 74) from Georges Bank, nor in any hairy hermit crabs (P. arcuatus and P. pubescens) on the Scotian Shelf (n = 808), on Georges Bank (n = 14), or in the northern Gulf of St. Lawrence (n = 87). A single sand shrimp (Crangon septemspinosa) of 1254 collected from the Scotian Shelf in 1989 and 1990 was infected with a metacercaria of S. formosum. None of 421 pink shrimps (Pandalus spp.) collected from the Scotian Shelf in 1989 and 1995 was infected. Male and female reproductive systems were well developed and spermatozoa were observed in the seminal receptacles of most parasites, suggesting that these metacercariae are progenetic. The distribution of the parasite among potential intermediate hosts suggests that S. formosum demonstrates greater specificity for its second intermediate host in the Northwest Atlantic than it does in the Pacific or in the Northeast Atlantic oceans.

Experimental studies on the transmission dynamics of the cercariae of Echinoparyphium recurvatum (Digenea: Echinostomatidae)

Parasitology ◽  
1983 ◽  
Vol 87 (1) ◽  
pp. 167-174 ◽  
Author(s):  
N. A. Evans ◽  
D. M. Gordon
Keyword(s):  
Life Span ◽  
Intermediate Host ◽  
Experimental Studies ◽  
Intermediate Hosts ◽  
Maximum Life Span ◽  
Age Dependent ◽  
Second Intermediate Host ◽  
The Mean ◽  
The Relationship ◽  
First Intermediate Host

SUMMARYAge-dependent survival and infectivity characteristics are described for the cercariae of Echinoparyphium recurvatum. At 18 °C the maximum life-span of the cercariae was 48 h and 50% survival occurred at 30·5 h. Infectivity of cercariae to the second intermediate host, Lymnaea peregra was maximal approximately 2 h after emission from the first intermediate host and it subsequently declined to zero at 19 h. It is suggested that the period of sub-maximal infectivity at the beginning of the cercarial life-span may represent a phase during which dispersal is an important function of the larvae. The relationship between infective stage density and establishment success was linear up to densities equivalent to 5000 cercariae/1. At higher cercarial densities the proportion of parasites establishing in second intermediate hosts declined progressively with increasing cercarial density. The mean number of parasites establishing/host increased linearly with increasing host size.

Temporal variation of Meiogymnophallus minutus infections in the first and second intermediate host

2010 ◽  
Vol 84 (4) ◽  
pp. 362-368 ◽  
Author(s):  
J. Fermer ◽  
S.C. Culloty ◽  
T.C. Kelly ◽  
R.M. O'Riordan
Keyword(s):  
Temporal Variation ◽  
Intermediate Host ◽  
Seasonal Patterns ◽  
Intertidal Flat ◽  
Infection Rates ◽  
Intermediate Hosts ◽  
Cerastoderma Edule ◽  
Scrobicularia Plana ◽  
Second Intermediate Host ◽  
First Intermediate Host

AbstractIn order to study seasonal patterns of Meiogymnophallus minutus infections in its intermediate hosts, bivalve samples were collected monthly between April 2008 and March 2009 from a high intertidal flat at Courtmacsherry Bay, Ireland. Infection rates in the first intermediate host Scrobicularia plana did not fluctuate significantly with season. Completely developed M. minutus cercariae appeared in daughter sporocysts from June and prevailed from July to October, indicating that transmission of M. minutus from its first to its second intermediate host is confined to this period of the year. All analysed individuals of the second intermediate host Cerastoderma edule were found to be infected with metacercariae. Infection levels significantly increased in September, suggesting recent cercarial invasions. Throughout the year, the majority of metacercariae were hyperinfected by the pathogenic microsporidian Unikaryon legeri. Spreading of hyperinfections was confined to spring and summer. Newly settled metacercariae were not affected by hyperparasitism and presumably retained their infectivity for half a year. Our findings suggest that the spreading of hyperinfections is correlated with higher water temperatures and that the entire metacercarial population has to rebuild every year as a consequence of hyperparasite-induced mortality.

Two cases of natural human infection by Echinostoma hortense and its second intermediate host in Wonju area

1985 ◽  
Vol 23 (1) ◽  
pp. 33 ◽  
Author(s):  
Yong Suk Ryang ◽  
Yung Kyum Ahn ◽  
Kyung Won Lee ◽  
Tai Seung Kim ◽  
Min Hee Hhan
Keyword(s):  
Intermediate Host ◽  
Human Infection ◽  
Second Intermediate Host

Trematode parasites of snails from Edgbaston Pool: the life history of the strigeid Cotylurus brevis Dubois & Rausch, 1950

Parasitology ◽  
1960 ◽  
Vol 50 (3-4) ◽  
pp. 551-575 ◽  
Author(s):  
P. Nasir
Keyword(s):  
Life History ◽  
Intermediate Host ◽  
Lymnaea Stagnalis ◽  
Intermediate Hosts ◽  
Experimental Conditions ◽  
Planorbis Corneus ◽  
History Of ◽  
Second Intermediate Host ◽  
First Time ◽  
Trematode Parasites

1. The life cycle of Cotylurus brevis Dubois and Rausch, from the cercaria to the adult, has been investigated for the first time by using laboratory-bred primary, secondary and definitive hosts. The holometabolic metamorphosis with the formation of a tetracotyle stage in a second intermediate host has been described in detail.2. The cercaria of C. brevis obtained from Lymnaea stagnalis in Edgbaston Pool has been found to be identical with Cercaria helvetica XXXIV Dubois from Lake Neuchâtel. The total number of flame cells in the cercaria is twenty, as opposed to the fourteen in the cercaria of Cotylurus cornutus Rudolphi (= ‘Strigea tarda’ described by Mathias (1925), Harper (1929, 1931) and Wesenberg-Lund (1934)).3. In nature the second intermediate host of Cotylurus brevis is Lymnaea stagnalis. Under experimental conditions L. pereger and L. auricularia were also found to act as second intermediate hosts, but neither Planorbis corneus, P. carinatus nor various leeches could act as second intermediate hosts.4. The tetracotyle stage of Cotylurus brevis is morphologically indistinguishable from the corresponding stage of other species of Cotylurus.

Metazoan parasites in an intermediate host population near its southern border: the common cockle (Cerastoderma edule) and its trematodes in a Moroccan coastal lagoon (Merja Zerga)

2008 ◽  
Vol 88 (2) ◽  
pp. 357-364 ◽  
Author(s):  
Mériame Gam ◽  
Hocein Bazaïri ◽  
K. Thomas Jensen ◽  
Xavier de Montaudouin
Keyword(s):  
Species Composition ◽  
Intermediate Host ◽  
Coastal Lagoon ◽  
Life Cycles ◽  
Geographical Range ◽  
Trematode Species ◽  
Intermediate Hosts ◽  
Metazoan Parasites ◽  
Cerastoderma Edule ◽  
Second Intermediate Host

The metazoan parasite community of Cerastoderma edule was studied in the southern geographical range of the host (the coastal lagoon Merja Zerga, Morocco). A total of 11 metazoan species was found in cockles. Nine of these were trematodes using cockles as either first intermediate host (three species) or second intermediate host (six species). In addition, two other endo-metazoan species (Pinnotheres pisum and Paravortex cardii) were recorded from cockles in the studied lagoon. All the observed metazoans in cockles from Merja Zerga have previously been recorded at sites north of Africa.Up to 10% of the cockles in the studied size-groups were first intermediate hosts to castrating parasites (Gymnophallus choledochus, Labratrema minimus and Monorchis parvus). Among trematodes having metacercariae in cockles (second intermediate host) Meiogymnophallus minutus was the most widespread as it was observed in all cockles from all the examined habitats in the lagoon and it occurred in record high intensities. Different sub-communities of the trematode fauna using cockles as second intermediate host could be identified (subtidal vs intertidal associations).The richness and species composition of the macroparasite community in cockles from Morocco are discussed in relation to patterns seen in cockles from other sites along their geographical range. Migratory fish and waterbirds (final hosts) are generally responsible for the large scale spread (latitudinal spread) of trematodes. However, the distributional patterns of involved intermediate hosts in the life-cycles of the different trematode species in cockles are determining the richness and species composition patterns seen in cockles at shallow water sites along the east Atlantic shoreline.

The function of the paraoesophageal glands in an echinostome (digenean) cercaria (? Cercaria spinifera La Valette, 1855)

1989 ◽  
Vol 63 (3) ◽  
pp. 231-238 ◽  
Author(s):  
G. Cleveland ◽  
G. C. Kearn
Keyword(s):  
Intermediate Host ◽  
The Body ◽  
Intermediate Hosts ◽  
Host Preferences ◽  
Planorbarius Corneus ◽  
Second Intermediate Host ◽  
First Time

ABSTRACTAn echinostome cercaria (? Cercaria spinifera La Valette, 1855) with 37 collar spines and paraoesophageal glands has been recorded for the first time in Britain from the gastropod Planorbarius corneus. The cercariae penetrate into and encyst in planarians. Observations made on cercariae during penetration indicate that the paraoesophageal glands are used to enter the body of the planarian and that the so-called penetration glands have some other function. Gastropod molluscs may also serve as second intermediate hosts, but there is evidence to indicate that anatomically similar cercariae from different host individuals vary in their second intermediate host preferences.

scholarly journals Dicrocoelium DendriticumInfection in a Patient with Crohn’s Disease

2008 ◽  
Vol 22 (6) ◽  
pp. 571-573 ◽  
Author(s):  
Franzjosef Schweiger ◽  
Magdalena Kuhn
Keyword(s):  
Crohn’S Disease ◽  
Crohn's Disease ◽  
Medical Literature ◽  
Present Report ◽  
Land Snail ◽  
Human Infection ◽  
Complex Life Cycle ◽  
Intermediate Hosts ◽  
Animal Liver ◽  
Second Intermediate Host

Infection withDicrocoelium dendriticumin humans is rarely reported in the medical literature. This liver fluke, which commonly infects ruminants, has a complex life cycle with two intermediate hosts – the land snail and the ant. True human infection occurs by ingestion of the second intermediate host, but spurious infections have occurred after consumption of undercooked animal liver. The present report describes a patient with active Crohn’s disease whose stool containedD dendriticumeggs. A brief discussion of the medical literature is presented.

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