Most species of veterinary significant can be found worldwide though they are more prevalent in areas with warmer climates.
Most species of veterinary significant can be found worldwide though they are more prevalent in areas with warmer climates.
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==Pathogenesis==
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Large parasite burdens of ''C. punctata'' and ''C. pectinata'' can cause severe diarrhoea, anorexia and emaciation without the presence of anaemia as they do not feed on the hosts blood. Other species are considered mild pathogens but will also cause poor weight gain and productivity. These species are often present as secondary pathogens after infection with more pathogenic ''[[Ostertagia]]'' and ''[[Haemonchus]]'' species.