Changes

*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

====Arrested larval development====(synonyms: inhibited development, hypobiosis, diapause)

==== 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