Terminal phase of bird schistosomiasis caused by Trichobilharzia regenti (Schistosomatidae) in ducks (Anas platyrhynchos f. domestica)

Chanová, Marta; Horák, Petr

doi:10.14411/fp.2007.014

Cited by 18 publications

(19 citation statements)

References 8 publications

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“…Immature eggs appeared from day 15 p.i., and at day 19 p.i., eggs were fully developed and observed extravascularly in the nasal mucosa, with the maximum number of eggs seen on day 22 p.i. (221). The area surrounding the eggs was infiltrated by numerous eosinophils, heterophils, histiocytes, and multinucleated giant cells and a few plasma cells and mononucleated cells (220).…”

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

“…The formation of granulomas around the eggs was noted from day 22 p.i. (221). Miracidia that hatched directly in the host tissue were surrounded by lymphocytes, eosinophils, and heterophils, without granuloma formation (221).…”

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

“…(221). Miracidia that hatched directly in the host tissue were surrounded by lymphocytes, eosinophils, and heterophils, without granuloma formation (221). While an infected bird is drinking/feeding, only the miracidia leave the tissue to enter the water, which represents an exceptional mode of transmission among schistosomes (205).…”

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

“…While an infected bird is drinking/feeding, only the miracidia leave the tissue to enter the water, which represents an exceptional mode of transmission among schistosomes (205). The presence of adults only did not initiate an influx of immune cells to their vicinity, but the presence of large worms and eggs caused the development of focal hemorrhages throughout the nasal mucosa (207,221). Probably the more devastating aspect of the pathology of this species is the effect on the CNS of hosts (birds and experimental mammals).…”

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

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Avian Schistosomes and Outbreaks of Cercarial Dermatitis

et al. 2015

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SUMMARY Cercarial dermatitis (swimmer's itch) is a condition caused by infective larvae (cercariae) of a species-rich group of mammalian and avian schistosomes. Over the last decade, it has been reported in areas that previously had few or no cases of dermatitis and is thus considered an emerging disease. It is obvious that avian schistosomes are responsible for the majority of reported dermatitis outbreaks around the world, and thus they are the primary focus of this review. Although they infect humans, they do not mature and usually die in the skin. Experimental infections of avian schistosomes in mice show that in previously exposed hosts, there is a strong skin immune reaction that kills the schistosome. However, penetration of larvae into naive mice can result in temporary migration from the skin. This is of particular interest because the worms are able to migrate to different organs, for example, the lungs in the case of visceral schistosomes and the central nervous system in the case of nasal schistosomes. The risk of such migration and accompanying disorders needs to be clarified for humans and animals of interest (e.g., dogs). Herein we compiled the most comprehensive review of the diversity, immunology, and epidemiology of avian schistosomes causing cercarial dermatitis.

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Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

Section: Pathology Caused By Nasal Species In Birds and Micementioning

confidence: 99%

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Avian Schistosomes and Outbreaks of Cercarial Dermatitis

et al. 2015

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“…Avian schistosomes are reported to infect different birds, with the differentiation of two groups of parasite, according to the localization of the adult worms in the natural final hosts : visceral schistosomes which are located in the venous system of the intestinal and hepatic sphere and nasal schistosomes that live in the nasal cavities of their host. The migration of these nasal schistosomes includes a passage through the nervous system of the definitive host before reaching at the final localization of the mature worms (Hrádková and Horák 2002;Kourilová et al 2004;Blazová and Horák 2005;Horák and Kolárová 2005;Chanová and Horák 2007). The description of bird schistosomes raises new questions about pathogenic risks in the event of infestation of humans, especially in cases where cercariae are not captured in the human skin (causing maculopapular eruptions) thus preventing temporarily migration of the parasite within this incompatible host.…”

Section: Introductionmentioning

confidence: 99%

Final hosts and variability of Trichobilharzia regenti under natural conditions

et al. 2010

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In Europe, despite of intensive work on avian schistosomes in the past, only one representative of nasal schistosomes has been detected so far, Trichobilharzia regenti, a species that remained undescribed to the scientific community until 1998. Since then, however, T. regenti has gained a considerable attention, not only due to the induction of serious lesions concomitant with the migration of the schistosomulae through the central nervous system of their natural hosts (birds) but also due to their implication in cercarial dermatitis and their neurotrophic behaviour in mammals (mice, experimental) where the parasite migrate to the CNS. From 2001 to 2010, by a parasitic control of various potential final hosts (aquatic birds) living in natural condition in France and in Iceland, we detected T. regenti in six species: Anas platyrhynchos, Cygnus olor, Aythya fuligula, Aythya ferina, Mergus merganser and Anser anser. Although morphological features, mainly of eggs, showed some variations with the original description of the parasite, molecular analysis confirmed their membership to the T. regenti species. Nevertheless, specific molecular and morphological variations were especially observed for nasal parasite isolated from Anas clypeata. For this species, we discuss the possibility for this nasal schistosome to belong to a nasal Trichobilharzia species already described in Africa or even an undescribed nasal species.

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Cathepsins B1 and B2 of Trichobilharzia SPP., Bird Schistosomes Causing Cercarial Dermatitis

Kašný

Mikeš

Dolečková

et al. 2011

Advances in Experimental Medicine and Biology

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Trichobilharzia regenti and T. szidati are schistosomes that infect birds. although T. regenti/T. szidati can only complete their life cycle in specific bird hosts (waterfowl), their larvae-cercariae are able to penetrate, transform and then migrate as schistosomula in nonspecific hosts (e.g., mouse, man). Peptidases are among the key molecules produced by these schistosomes that enable parasite invasion and survival within the host and include cysteine peptidases such as cathepsins B1 and B2. These enzymes are indispensable bio-catalysts in a number of basal biological processes and host-parasite interactions, e.g., tissue invasion/migration, nutrition and immune evasion. Similar biochemical and functional characteristics were observed for cathepsins B1 and B2 in bird schistosomes (T. regenti, T. szidati) and also for their homologs in human schistosomes (Schistosoma mansoni, S. japonicum). Therefore, data obtained in the research of bird schistosomes can also be exploited for the control of human schistosomes such as the search for targets of novel chemotherapeutic drugs and vaccines.

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Terminal phase of bird schistosomiasis caused by Trichobilharzia regenti (Schistosomatidae) in ducks (Anas platyrhynchos f. domestica)

Abstract: Abstract. The terminal phase

Cited by 18 publications

References 8 publications

Avian Schistosomes and Outbreaks of Cercarial Dermatitis

Avian Schistosomes and Outbreaks of Cercarial Dermatitis

Final hosts and variability of Trichobilharzia regenti under natural conditions

Cathepsins B1 and B2 of Trichobilharzia SPP., Bird Schistosomes Causing Cercarial Dermatitis

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