Liver fluke<i>Fasciola hepatic</i>a in sheep and cattle in New Zealand and its control

Rv, Brunsdon

doi:10.1080/00480169.1976.33678

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…At approximately 5 weeks post-infection, the lesions are similar to those of acute fascioliasis; however, the functional reserves of the liver are sufficient to avoid death (Sewell 1966;Rushton and Murray 1977). In cases of acute fasciolosis, sheep do not usually succumb to their disease before week 7 or 8 of infection; at this stage, approximately 60 % of flukes are migrating in the left liver lobe (Brunsdon 1967;Dow et al 1968). …”

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confidence: 95%

“…The acute and subacute forms are primarily due to mechanical damage caused by the simultaneous migration of more than 1,000 immature flukes in the hepatic parenchyma (Boray 1967;Brunsdon 1967;Müller 2007). The chronic form develops when the adult parasites migrate to the bile duct, where they cause cholangitis, biliary obstruction, and fibrosis (Radostits et al 2007).…”

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confidence: 99%

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Subacute and acute fasciolosis in sheep in southern Brazil

et al. 2012

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Eight outbreaks of acute and subacute fasciolosis are reported in sheep in the municipality of Santa Vitória do Palmar, southern Brazil, in areas used for irrigated rice cultivation, which are subject to frequent flooding. Two outbreaks occurred mid-winter during July and August, and six occurred during spring and early summer. Morbidity ranged from 3 to 66.7 %, and mortality ranged from 3 to 50 %. Clinical signs included weight loss, mucosal pallor, apathy, depression, muscle tremors, and drooling; these were followed by death within approximately 24 h. Some sheep were found dead. Gross lesions were characterized by an irregular liver capsule with fibrin deposition and hemorrhages. The liver parenchyma contained hemorrhagic tracts or irregular clear areas alternated with dark hemorrhagic areas. Histologically, hemorrhagic dark red tracts of necrotic liver parenchyma and an inflammatory infiltrate were noted; these lesions coincided with the presence of immature flukes. Langhans-type giant cells, fibrous tissue, and bile duct cell proliferation were observed in subacute cases. Chronic fasciolosis is a well-known disease to farmers in southern Brazil; nevertheless, acute and subacute fasciolosis, which are more difficult to diagnose and treat, may cause important economic losses. Efficient control of fasciolosis requires integration of measures to treat infections in the definitive host, to reduce the population of snails of the genus Lymnaea, and to avoid contact between the parasite and host by appropriate pasture management.

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confidence: 95%

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confidence: 99%

Subacute and acute fasciolosis in sheep in southern Brazil

et al. 2012

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“…It should be pointed out, however, that to date there has been no real attempt to accurately assess the economic impact of liver flukes on cattle in this country. For further information about the distribution and biology of F. hepatica in sheep and cattle in New Zealand see Brunsdon (1967Brunsdon ( , 1977, Pullan (1969), Harris & Charleston (1971, Pullan & McNab (1972), Pullan & Whitten (1972), Faull (1987), and Charleston et al (1990), and see Jonathan (1950Jonathan ( , 1952 for information about C. calicophorum.…”

Section: Types and Geographic Distribution Of Helminth Parasites Of Cmentioning

confidence: 99%

“…The earliest published records of liver fluke (Fasciola hepatica) in sheep and cattle in New Zealand appeared at around the same time (e.g., Park 1897). An account of these early records is given in Brunsdon (1967).…”

Section: Introductionmentioning

confidence: 99%

Helminth parasites of economic importance in cattle in New Zealand

Bisset

1994

New Zealand Journal of Zoology

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New Zealand farmers are currently spending about $27.9 million/yr on anthelmintics to control helminth parasites in cattle. Productivity trials carried out over the last 30 years show that the benefit-cost ratio of an effective drench programme is likely to be high, particularly in young animals in their first year, which tend to be very susceptible to infection. In New Zealand, cattle have been recorded as the definitive host of at least 27 nematode species, two trematode species, and one (possibly two) cestode species. Of these, three gastrointestinal nematode species/species complexes, Ostertagia ostertagi/O. lyrata, Trichostrongylus axei, and Cooperia oncophora/C. surnabada are generally considered to be of greatest and most widespread economic importance. In New Zealand, as overseas, bovine ostertagiosis occurs in two clinical forms, referred to as Type I and Type II. Type I ostertagiosis is the normal form of the disease seen in weaner cattle, while Type II ostertagiosis results from the rapid maturation of large burdens of arrested fourth stage larvae of Ostertagia spp., which can accumulate in the stomach wall of yearling and older cattle. While some of the nematode species that have been recorded from cattle were simply incidental infections resulting from cross transmission from different host species (particularly sheep), one species complex, Ostertagia leptospicularis/ kolchida, which is normally considered to be a cervid parasite, is known to cycle readily in young cattle and has been implicated in clinical disease. The liver fluke Fasciola hepatica can be economically significant in cattle under certain local conditions but, while its distribution has increased markedly over the last 20 years, it is still generally considered to be a relatively minor problem in the national sense.

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“…Diagnosis of fasciolosis is hindered by non-specific clinical signs, variable faecal fluke egg counts (FFEC) combined with long pre-patent periods, limitations of ELISA methods and molecular technologies and heavy reliance on necropsy for the diagnosis of acute fasciolosis ( Brunsdon, 1967 , George et al, 2017 , Gordon et al, 2012a ). While traditional faecal flotation techniques ( Happich and Boray, 1969 ) continue to be utilized due to basic equipment and low costs, efficiency per sample is questionable ( Gordon et al, 2012b ).…”

Section: Introductionmentioning

confidence: 99%