Nematodes with indirect life-cycle
Name of infective stage Mode of infection Example
Infective larva (L3) Ingestion of Various
inside intermediate host intermediate host metastrongylid and all
spiruroid worms
Infective larvae (L3) Injection of L3 All filarial worms
inside proboscis of during blood feeding
blood sucking
insects
on the host
(biological vectors)
Trichinella spiralis, being autoheteroxenous, is transmitted by ingestion of raw or
partially cooked flesh containing encysted infective larvae of an infected definitive host.