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Also known as;
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{| cellpadding="10" cellspacing="0" border="1"
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| Predilection site
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| Small intestine
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|}
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===Introduction===
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''N. battus'' is most prominent within the UK, but is also present to a lesser extend in Norway, Sweden, the Netherlands, and Canada.  In heavy infections this parasite can be severe, and if left untreated can lead to the death of the carrying host. 
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It is a nematode , and is part of the '''Trichostrongyloidea''' superfamily.
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===Hosts===
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Mainly sheep and goats, but infected cattle are occassionally found.
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===Life Cycle===
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The lifecycle of ''N. battus'' is different from to the common '''Trichostrongyle''' lifecycle.
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L1-L3 occurs within the egg.  The larvae takes several months to develop.  Hatching is stimulated by a cold period followed by a night/day temperature of around 10 degrees.  The L3 are highly susceptible to changes in climate, so must be ingested soon after moulting to ensure the success of infection.
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Pathology is seen when large number of '''larvae''' inhabit the small intestine.
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''N. battus'' can only hatch from eggs excreted on to pasture in the previous year.
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===Identification===
 
===Identification===
 
A mature adult is around 2cm longer.  The female has a prominent spine projecting from the end.  The male has a very long slender tail with spicules extended past the bursa.
 
A mature adult is around 2cm longer.  The female has a prominent spine projecting from the end.  The male has a very long slender tail with spicules extended past the bursa.
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''N. battus'' eggs are larger than the typical egg of a '''Trichostrongyle''', and have a brownish colouration.
    
* A cause of parasitic [[Enteritis, Parasitic|catarrhal enteritis]].
 
* A cause of parasitic [[Enteritis, Parasitic|catarrhal enteritis]].
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