Relationships between the Species of Fasciola and their Molluscan Hosts

Sb, Kendall

doi:10.1016/s0065-308x(08)60256-0

Cited by 54 publications

(30 citation statements)

References 10 publications

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“…The presence of lymnaeid vectors defines not only the distribution of fascioliasis, but may also explain the distribution of human infection within a country, as has been recently observed in different countries (Artigas et al 2011;Bargues et al 2011b, c), and within an endemic area, as well as its seasonality or permanent transmission (Bargues et al 2012). In southern Asia, G. truncatula is restricted to the highlands in countries such as Afghanistan and Pakistan (Kendall, 1954(Kendall, , 1965 and its absence as well as the lack of appropriate Galba/Fossaria lymnaeid species for the development of F. hepatica in India and eastward up to South-east Asia is well known (Mas-Coma et al 2009a). In Bangladesh, G. truncatula has never been found, nor does the country have temperatures below 15°C (except for about 10 days a year), which indicates a scenario not appropriate for the transmission of F. hepatica.…”

Section: Discussionmentioning

confidence: 85%

CIAS detection of Fasciola hepatica/F. gigantica intermediate forms in bovines from Bangladesh

Ahasan¹,

Valero

Chowdhury

et al. 2016

Acta Parasitologica

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Fascioliasis is an important food-borne parasitic zoonosis caused by two trematode species, Fasciola hepatica and Fasciola gigantica. The characterisation and differentiation of Fasciola populations is crucial to control the disease, given the different transmission, epidemiology and pathology characteristics of the two species. Lineal biometric features of adult liver flukes infecting livestock have been studied to characterise and discriminate fasciolids from Bangladesh. An accurate analysis was conducted to phenotypically discriminate between fasciolids from naturally infected bovines (cattle, buffaloes) throughout the country. Morphometric analyses were made with a computer image analysis system (CIAS) applied on the basis of standardised measurements and the logistic model of the body growth and development of fasciolids in the different host groups. Since it is the first ever comprehensive study of this kind undertaken in Bangladesh, the results are compared to pure fasciolid populations of F. hepatica from the European Mediterranean area and F. gigantica from Burkina Faso, geographical areas where both species do not co-exist. Principal component analysis showed that the biometric characteristics of fasciolids from Bangladesh are situated between F. hepatica and F. gigantica standard populations, indicating the presence of phenotypes of intermediate forms in Bangladesh. These results are analysed by considering the present emergence of animal fascioliasis, the local lymnaeid fauna, the impact of climate change, and the risk of human infection in the country.

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Section: Discussionmentioning

confidence: 85%

CIAS detection of Fasciola hepatica/F. gigantica intermediate forms in bovines from Bangladesh

Ahasan¹,

Valero

Chowdhury

et al. 2016

Acta Parasitologica

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“…The valid species of the genus Fasciola are F. hepatica and F. gigantica [9]. Except in some older papers on the chromosomal observation, the chromosome number is 20 (2n=20) in both F. hepatica and F. gigantica, and both species are believed to be normal zygotes (diploid) [12,18,21].…”

Section: Resultsmentioning

confidence: 99%

Abnormal Spermatogenesis in the Common Liver Fluke (Fasciola sp.) from Japan and Korea.

1998

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ABSTRACT. Diploid and triploid specimens of Japanese and Korean Fasciola sp. showed abnormality in their spermatogenesis. Live germ cells obtained from the testes were observed under a differential interference contrast microscope. In the stages from spermatogonium to spermatid, the cells combined together at the central cytoplasmic bridge during a series of divisions. One spermatogonium becomes a cell group of 8 primary spermatocytes through 3 mitoses. Until the primary spermatocyte stage, cells are divided in a uniform manner. In most of the diploid specimens, the primary spermatocytes are irregularly divided into non-uniform secondary spermatocytes, however, some specimens perform a regular division. In the majority of triploid flukes, the primary spermatocytes are divided in a regular pattern, but some of the specimens perform an irregular division. The non-uniform spermatids do not perform a spermiogenesis. In the diploid specimens, no spermatozoa were found that were produced by spermiogenesis. Whereas in the triploid specimens, some spermatids distributed uniformly on the surface went through a spermiogenesis. We observed some moving spermatozoa in one triploid specimen. The spermatozoa possibly retain their normal reproductive function. -KEY WORDS: chromosome, Fasciola, parthenogenesis, spermatogenesis, triploid.

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“…A literature review on this last point demonstrated the existence of conflicting results. Negative infections of R. natalensis with F. hepatica were reported by several authors (Kendall, 1965;Boray, 1966;Mohamed et al, 1998;Hussein & Khalifa, 2008). In contrast, in another experiment, Boray (1969) obtained successful infections of young snails and the production of viable cercariae when he used a Kenyan population of R. natalensis and European isolates of F. hepatica.…”

Section: Introductionmentioning

confidence: 85%

Radix natalensis(Gastropoda: Lymnaeidae), a potential intermediate host ofFasciola hepaticain Egypt

et al. 2010

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Relationships between the Species of Fasciola and their Molluscan Hosts

Cited by 54 publications

References 10 publications

CIAS detection of Fasciola hepatica/F. gigantica intermediate forms in bovines from Bangladesh

CIAS detection of Fasciola hepatica/F. gigantica intermediate forms in bovines from Bangladesh

Abnormal Spermatogenesis in the Common Liver Fluke (Fasciola sp.) from Japan and Korea.

Radix natalensis(Gastropoda: Lymnaeidae), a potential intermediate host ofFasciola hepaticain Egypt

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