Topic
Hypoderaeum conoideum
About: Hypoderaeum conoideum is a research topic. Over the lifetime, 56 publications have been published within this topic receiving 986 citations.
Papers published on a yearly basis
Papers
TL;DR: The host-parasite relationships have been studied in Metagonimus yokogawai, Echinostoma hortense, Fasciolopsis buski, Neodiplostomum seoulense, and Gymnophalloides seoi; however, the pathogenicity of each parasite species and host mucosal defense mechanisms are yet poorly understood.
Abstract: In Southeast Asia, a total of 59 species of foodborne intestinal flukes have been known to occur in humans. The largest group is the family Heterophyidae, which constitutes 22 species belonging to 9 genera (Centrocestus, Haplorchis, Heterophyes, Heterophyopsis, Metagonimus, Procerovum, Pygidiopsis, Stellantchasmus, and Stictodora). The next is the family Echinostomatidae, which includes 20 species in 8 genera (Artyfechinostomum, Acanthoparyphium, Echinochasmus, Echinoparyphium, Echinostoma, Episthmium, Euparyphium, and Hypoderaeum). The family Plagiorchiidae follows the next containing 5 species in 1 genus (Plagiorchis). The family Lecithodendriidae includes 3 species in 2 genera (Phaneropsolus and Prosthodendrium). In 9 other families, 1 species in 1 genus each is involved; Cathaemaciidae (Cathaemacia), Fasciolidae (Fasciolopsis), Gastrodiscidae (Gastrodiscoides), Gymnophallidae (Gymnophalloides), Microphallidae (Spelotrema), Neodiplostomidae (Neodiplostomum), Paramphistomatidae (Fischoederius), Psilostomidae (Psilorchis), and Strigeidae (Cotylurus). Various types of foods are sources of human infections. They include freshwater fish, brackish water fish, fresh water snails, brackish water snails (including the oyster), amphibians, terrestrial snakes, aquatic insects, and aquatic plants. The reservoir hosts include various species of mammals or birds.The host-parasite relationships have been studied in Metagonimus yokogawai, Echinostoma hortense, Fasciolopsis buski, Neodiplostomum seoulense, and Gymnophalloides seoi; however, the pathogenicity of each parasite species and host mucosal defense mechanisms are yet poorly understood. Clinical aspects of each parasite infection need more clarification. Differential diagnosis by fecal examination is difficult because of morphological similarity of eggs. Praziquantel is effective for most intestinal fluke infections. Continued efforts to understand epidemiological significance of intestinal fluke infections, with detection of further human cases, are required.
197 citations
TL;DR: The results of this study show, that host-finding mechanisms and the stimulating host cues of snail invading echinostome cercariae differ considerably from those of schistosome miracidia.
Abstract: Finding and recognition of snail second intermediate hosts was studied in cercariae of 3 echinostome species. The cercariae of the 3 species accumulated in snail-conditioned water (SCW) with 2 types of orientation mechanisms and responded to different small molecular weight ( < 500 Da) components of SCW. Pseudechinoparyphium echinatum and Echinostoma revolutum cercariae returned by swimming an arc, when swimming in decreasing concentration gradients of SCW (turn-back swimming). The stimulating cues of SCW were identified as hydrophilic organic molecules, probably possessing amino groups. Amino acids contributed to the attractivity of SCW, at least in P. echinatum, but they could not account for the complete attractivity of SCW. Hypoderaeum conoideum were directed chemotactically and swam along increasing concentration gradients of small peptides within SCW, but in decreasing SCW gradients they showed no turn-back swimming. Chemotactic orientation in H. conoideum only started 1 h after emission, which may assist the cercariae to leave the immediate area of their first intermediate host snails and to disperse. Attachments occurred specifically to snail hosts in the 3 species and were stimulated by macromolecular mucus compounds, probably mainly by viscoelastic properties of the mucus. The results of this study show, that host-finding mechanisms and the stimulating host cues of snail invading echinostome cercariae differ considerably from those of schistosome miracidia.
60 citations
TL;DR: A dominant theme of the review is the availability of key species of echinostomes for use in biological research; coverage also includes methods for obtaining and maintaining these organisms in the laboratory.
Abstract: This review examines the significant literature on the biology of echinostomes, except Echinostoma, for the following species rich genera: Echinoparyphium, Echinochasmus, Himasthla, and Hypoderaeum. Coverage of these genera includes descriptive studies, life cycle studies, experimental and manipulative studies, and biochemical and molecular studies. Coverage of other echinostome genera, i.e., Petasiger, Euparyphium, Stephanoprora, Isthmiophora, Acanthoparyphium, and Patagifer was mainly concerned with descriptive and life cycle studies. Some groups that are considered echinostome-like were covered because species in these genera have medical, economic, or biological significance (particularly Parorchis, Philophthalmus, and Ribeiroia). A dominant theme of the review is the availability of key species of echinostomes for use in biological research; coverage also includes methods for obtaining and maintaining these organisms in the laboratory. Some species with significant medical, veterinary, and biological importance that have been covered extensively include the Echinoparyphium recurvatum species complex, Echinochasmus liliputanus, Himasthla quissetensis, Himasthla rhigadana, and Hypoderaeum conoideum.
47 citations
TL;DR: Foodborne intestinal flukes are highly diverse consisting of at least 74 species with a diverse global distribution and epidemiological characteristics such as the prevalence, geographical distribution, and clinical and public health significance are poorly known.
46 citations
TL;DR: The results suggest that the morphological characters used for species taxonomy of echinostomes in South-East Asia should be reconsidered according to the concordance of biology, morphology and molecular classification.
45 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 6 |
| 2019 | 1 |
| 2018 | 2 |
| 2016 | 1 |
| 2015 | 3 |