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Objectives: Human cercarial dermatitis (HCD) is a water-borne zoonotic parasitic disease. Cercariae of the avian schistosomes of several genera are frequently recognized as the causative agent of HCD. Various studies have been performed regarding prevalence of bird schistosomes in different regions of the world. So far, no study has gathered and analyzed this data systematically. The aim of this systematic review and meta-analysis study was to determine the prevalence of avian schistosomes worldwide.
Methods: Data were extracted from six available databases for studies published from 1937 to 2017. Generally, 41 studies fulfilled the inclusion criteria and were used for data extraction in this systematic review. Most of studies have been conducted on the family Anatidae.
Results: The overall prevalence of avian schistosomes was estimated to be 34.0% (95%CI, 28%-41%) around the world. Furthermore, results displayed that, and spp. had the highest frequency and their prevalence in the birds was 50.0% (95% CI, 3.0%-97.0%) and 32.0% (95% CI, 21.0%-0.36%), respectively. The results showed that the prevalence of avian schistosomes was 43.0% (95% CI, 29% - 56%) in the US and 38.0% (27.0% -50.0%) in Europe, which were higher than other continents, respectively.
Conclusions: The prevalence of 34% shows that the bird schistosomes are very common zoonotic worms among aquatic birds in the world. Also, this study shows the importance of avian schistosome research when facing animal and human health of the future.
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http://dx.doi.org/10.1016/j.parepi.2020.e00142 | DOI Listing |
Acta Parasitol
July 2025
Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway.
Objective: Cercarial dermatitis, often called swimmer’s itch, is a non-communicable skin condition caused by bird schistosomes. The host response is characterized by an early type I hypersensitivity reaction and a late phase of cutaneous inflammation, often leading to severe itching. Outbreaks of cercarial dermatitis in recreational waters can significantly impact public health.
View Article and Find Full Text PDFActa Trop
July 2025
Department of Applied Statistics, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, Thailand.
Avian blood flukes of the genus Trichobilharzia, the largest subgroup of the Schistosomatidae family, are of medical and veterinary importance as causative agents of avian schistosomiasis and human cercarial dermatitis. Despite their significance, molecular data on Trichobilharzia species from Southeast Asia remain limited, and no mitochondrial genomes have been reported to date. This study presents the first complete mitochondrial genome and nuclear ribosomal RNA (rRNA) gene analysis of a Trichobilharzia sp.
View Article and Find Full Text PDFParasit Vectors
May 2025
Charles University, Prague, Czechia.
Background: Cercarial dermatitis (CD), or swimmer's itch, is a water-borne allergic skin reaction caused by the penetration of the larval stages of bird schistosomes (cercariae) into the skin. Members of the genus Trichobilharzia are the primary causative agents of CD worldwide. Due to the increasing number of cases, CD is regarded as a (re)emerging disease.
View Article and Find Full Text PDFActa Trop
July 2025
Instituto de Histología y Embriología de Mendoza (IHEM CONICET), Avenida del Libertador S/N, Centro Universitario, Mendoza, Argentina; Instituto de Fisiología, Departamento de Bases Científicas en Salud, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Avenida del Libertador S/N, Cen
In the context of a research program dealing with the symbiotic associations between aquatic snails and trematodes, we studied a host-parasite consortium in Lake El Nihuil (Mendoza, Argentina), a water body from Atuel river basin (Central Andes) in which recent outbreaks of cercarial dermatitis ('swimmer's itch') occurred. According to the morphological traits and molecular phylogenetic analyses (mitochondrial COI and 16S rRNA genes), the gastropod host was assigned to the endemic genus Chilina. The snails hosted and released a schistosomatid brevifurcate apharingeate cercaria, whose phylogenetic position was inferred using 28S rRNA subunit gene and 18S-ITS1-5.
View Article and Find Full Text PDFPol Merkur Lekarski
May 2025
DEPARTMENT OF GENERAL, ONCOLOGICAL AND FUNCTIONAL UROLOGY MEDICAL UNIVERSITY WARSAW, WARSAW, POLAND.
Schistosomiasis very often illness in endemic countries caused by schistosoma haematobium and very rare disease, in Poland caused especially by birds flukes, and in travellers and refugees from endemic countries. It is important for urologist to keep in mind in differential diagnosis also this disease. Symptoms of the disease are primarily due to the body's reaction to the parasite's eggs and dead flukes forms, which cause inflammatory infiltrates.
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