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*Nematodes may survive inside the host for long periods of time, not as normally developing adult worms (that would be expelled within a few weeks), but as larval worms that have become temporarily arrested in their development and may remain inside the host 'asleep' for many months
 
*Nematodes may survive inside the host for long periods of time, not as normally developing adult worms (that would be expelled within a few weeks), but as larval worms that have become temporarily arrested in their development and may remain inside the host 'asleep' for many months
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'''Arrested larval development'''(synonyms: inhibited development, hypobiosis, diapause)
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'''Arrested larval development''' (synonyms: inhibited development, hypobiosis, diapause)
 
*Long lifespan of several months (c.f. adult worms; a few weeks only)
 
*Long lifespan of several months (c.f. adult worms; a few weeks only)
 
*Larvae become arrested at an early stage in their development e.g. ''Ostertagia'' as EL4 (i.e. early fourth stage), equine cyathostomes as L3
 
*Larvae become arrested at an early stage in their development e.g. ''Ostertagia'' as EL4 (i.e. early fourth stage), equine cyathostomes as L3
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