Relationships between host species and morphometric patterns in Fasciola hepatica adults and eggs from the northern Bolivian Altiplano hyperendemic region

Valero, M. Adela; Darce, N.Agustı́n; Panova, Miroslava; Mas‐Coma, Santiago

doi:10.1016/s0304-4017(01)00499-x

Cited by 96 publications

(76 citation statements)

References 25 publications

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“…The changes in different biometrical parameters of adult flukes at different times have been previously analysed (Valero et al 1998(Valero et al , 2001a(Valero et al , b, 2005(Valero et al , 2011. The corresponding growth curves were all logistic, which implies that the morphometric development of the adult fluke is not unlimited but ''damped'' and cannot exceed certain characteristic maxima of ym (= maximum value attained by a biometric variable).…”

Section: Discussionmentioning

confidence: 99%

“…Although metacercarial infectivity does not appear to differ in isolates from different livestock species (Valero and Mas-Coma, 2000), the definitive animal host species is known to pronouncedly influence the phenotype of both adult stage and eggs of the liver fluke, mainly due to the different size of the liver duct microhabitat (Valero et al 2001a(Valero et al , 2002. For this reason, only parasites obtained from bovines were used in the principal component analysis carried out in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…-Morphometric measurements used for fasciolid adults follow a logistic growth model with respect to time (Valero et al 2005). This implies that the morphometric development of the fasciolid adult is not limited but 'damped' and does not exceed certain characteristic maxima (Valero et al 2001a(Valero et al , b, 2006b(Valero et al , 2011. Since the morphometric maximum values are characteristic for each population, they are considered the comparative base of this study (Table II).…”

Section: Morphometricsmentioning

confidence: 99%

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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: 99%

Section: Discussionmentioning

confidence: 99%

Section: Morphometricsmentioning

confidence: 99%

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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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“…Species identification in the present study was done by emphasizing BL, BW, CL indices and BL/BW ratios as suggested in previous studies [19,20,21]. Groups based on maximum and minimum values of the morphological measurements of Fasciola hepatica, Fasciola gigantica or Fasciola sp.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Fasciola gigantica isolates from cattle from South-western Zimbabwe using RAPD-PCR

E.¹,

Dhlamini²,

Mbanga³

et al. 2014

IOSRJAVS

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“…Although different livestock species represent similar infection sources (Valero and Mas-Coma, 2000;Valero et al, 2001), animal species susceptibility should be considered. The livestock species influences fluke development and egg production and shedding (Valero et al, 1998(Valero et al, , 2002(Valero et al, , 2009).…”

Section: Livestock Influencing Prevalence Ratesmentioning

confidence: 99%

Impact of climate change and man-made irrigation systems on the transmission risk, long-term trend and seasonality of human and animal fascioliasis in Pakistan

et al. 2014

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Abstract. Large areas of the province of Punjab, Pakistan are endemic for fascioliasis, resulting in high economic losses due to livestock infection but also affecting humans directly. The prevalence in livestock varies pronouncedly in space and time (1-70%). Climatic factors influencing fascioliasis presence and potential spread were analysed based on data from five meteorological stations during 1990-2010. Variables such as wet days (Mt), water-budget-based system (Wb-bs) indices and the normalized difference vegetation index (NDVI), were obtained and correlated with geographical distribution, seasonality patterns and the two-decade evolution of fascioliasis in livestock throughout the province. The combined approach by these three indices proved to furnish a useful tool to analyse the complex epidemiology that includes (i) sheep-goats and cattlebuffaloes presenting different immunological responses to fasciolids; (ii) overlap of Fasciola hepatica and F. gigantica; (iii) co-existence of highlands and lowlands in the area studied; and (iv) disease transmission following bi-seasonality with one peak related to natural rainfall and another peak related to man-made irrigation. Results suggest a human infection situation of concern and illustrate how climate and anthropogenic environment modifications influence both geographical distribution and seasonality of fascioliasis risks. Increased fascioliasis risk throughout the Punjab plain and its decrease in the northern highlands of the province became evident during the study period. The high risk in the lowlands is worrying given that Punjab province largely consists of low-altitude, highly irrigated plains. The importance of livestock in this province makes it essential to prioritise adequate control measures. An annual treatment scheme to control the disease is recommended to be applied throughout the whole province.

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Relationships between host species and morphometric patterns in Fasciola hepatica adults and eggs from the northern Bolivian Altiplano hyperendemic region

Cited by 96 publications

References 25 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

Characterization of Fasciola gigantica isolates from cattle from South-western Zimbabwe using RAPD-PCR

Impact of climate change and man-made irrigation systems on the transmission risk, long-term trend and seasonality of human and animal fascioliasis in Pakistan

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