Contribuições Parazitolojicas: I

Neiva, Arthur; Cunha, Aristides Marques da; Travassos, Lauro

doi:10.1590/s0074-02761914000300005

Cited by 16 publications

(2 citation statements)

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“…Paramecium coli , described by Malmsten (1857) in human samples, was renamed Balantidium coli by Stein (1863) after describing it from pigs. Over the subsequent years, several Balantidium species were described from different wild and domestic mammals and birds based on morphological differences or the host species (Neiva et al, 1914; McDonald, 1922; Hegner, 1934). Alexeieff (1931) proposed transferring B. coli to a new genus, Balantioides , but, until recently, when Pomajbíková et al (2013) proposed a new genus, Neobalantidium , to accommodate species from mammals, this was not taken into consideration; Chistyakova et al (2014) consider Neobalantidium to be a junior synonym of Balantioides .…”

Section: Which Enteric Protozoan Pathogens Are Zoonotic and What Are mentioning

confidence: 99%

Are molecular tools clarifying or confusing our understanding of the public health threat from zoonotic enteric protozoa in wildlife?

Robertson

Clark

Debenham

et al. 2019

International Journal for Parasitology: Parasites and Wildlife

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Emerging infectious diseases are frequently zoonotic, often originating in wildlife, but enteric protozoa are considered relatively minor contributors. Opinions regarding whether pathogenic enteric protozoa may be transmitted between wildlife and humans have been shaped by our investigation tools, and have led to oscillations regarding whether particular species are zoonotic or have host-adapted life cycles. When the only approach for identifying enteric protozoa was morphology, it was assumed that many enteric protozoa colonized multiple hosts and were probably zoonotic. When molecular tools revealed genetic differences in morphologically identical species colonizing humans and other animals, host specificity seemed more likely. Parasites from animals found to be genetically identical - at the few genes investigated - to morphologically indistinguishable parasites from human hosts, were described as having zoonotic potential. More discriminatory molecular tools have now sub-divided some protozoa again. Meanwhile, some infection events indicate that, circumstances permitting, some “host-specific” protozoa, can actually infect various hosts. These repeated changes in our understanding are linked intrinsically to the investigative tools available. Here we review how molecular tools have assisted, or sometimes confused, our understanding of the public health threat from nine enteric protozoa and example wildlife hosts ( Balantoides coli - wild boar; Blastocystis sp. - wild rodents; Cryptosporidium spp. - wild fish; Encephalitozoon spp. - wild birds; Entamoeba spp. - non-human primates; Enterocytozoon bieneusi - wild cervids; Giardia duodenalis - red foxes; Sarcocystis nesbitti - snakes; Toxoplasma gondii - bobcats). Molecular tools have provided evidence that some enteric protozoa in wildlife may infect humans, but due to limited discriminatory power, often only the zoonotic potential of the parasite is indicated. Molecular analyses, which should be as discriminatory as possible, are one, but not the only, component of the toolbox for investigating potential public health impacts from pathogenic enteric protozoa in wildlife.

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Section: Which Enteric Protozoan Pathogens Are Zoonotic and What Are mentioning

confidence: 99%

Are molecular tools clarifying or confusing our understanding of the public health threat from zoonotic enteric protozoa in wildlife?

Robertson

Clark

Debenham

et al. 2019

International Journal for Parasitology: Parasites and Wildlife

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show abstract

“…In rodents, endosymbiotic ciliates were detected in association with Brazilian-guinea-pigs (Cavia aperea) , Neiva et al 1914, Hasselmann 1918, guinea-pigs (Cavia porcellus) (Alves et al 2007, Hasselmann 1918, coypus (Myocastor coypus) , gundis (Ctenodactylus gundi) (Chatton and Pérard 1919) and capybaras (Hydrochoerus hydrochaeris) ( Table 2).…”

Section: Introductionmentioning

confidence: 99%

Intestinal ciliates of Brazilian Capybara (Hydrochoerus hydrochaeris L.)

2018

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Abstract. In our study, we aimed to identify and quantify the intestinal ciliates in a Brazilian capybara and to compare the obtained data with previous studies on the capybara ciliate community in other geographic locations within the American continent. We identified 20 species belonging to four families and ten genera. This is the first study on intestinal ciliates in Brazilian capybara since the last reports for the country in the 1960s. Among the identified species, Anacharon gracilis, A. lepturus, Cycloposthium bursa, Monoposthium cynodontum, Ogimotopsis pumila, Paracunhamunizia calocoma, Protohallia nana and Uropogon urai were recorded for the first time in Brazil, and the giant ciliate Muniziella cunhai was observed for the second time in a symbiotic association with capybaras in the country. The present study highlighted the importance of knowing the gastrointestinal ciliate community associated with wild hosts in order to better understand their geographic distribution and host specificity.

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Studies on the Balantidium from the guinea‐pig

Scott

1927

Journal of Morphology

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THREE mxrr FIGURES AND SIX PLATES .4UTHOR'S ABSTRACTObservations indicate that this Balantidium from thc guinea-pig is Balantidium coli, the form found in the pig and man. The lengths and breadths of this Balantidium and the ratios of length to breadth are very close to the measurements and ratios given by NcDonald for B. coli. When plotted, the body lengths of the guinea-pig parasites appear in two groups, the smaller individuals being the exconjugants. Many of these exconjugants resemble Neiva's B. caviae. The structure of the Balantidium from the guinea-pig is essentially identical with that of B. coli as given by McDonald.Fission and conjugation of this ciliate follow the general course found in a number of other ciliates. During fission the micronucleus divides and the daughter micronuclei migrate to each end of the macronucleus before the latter divides. I n conjugation there are two divisions of the micronucleus, one of these nuclei dividing to form the pronuclei. Pronuclear exchange and fusion are followed by a heteropolar division of the synkaryon, resulting in the formation of the new macronuclear and micronuclear anlagen.

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Contribuições Parazitolojicas: I

Cited by 16 publications

References 0 publications

Are molecular tools clarifying or confusing our understanding of the public health threat from zoonotic enteric protozoa in wildlife?

Are molecular tools clarifying or confusing our understanding of the public health threat from zoonotic enteric protozoa in wildlife?

Intestinal ciliates of Brazilian Capybara (Hydrochoerus hydrochaeris L.)

Studies on the Balantidium from the guinea‐pig

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