Q:Write Down the Life cycle Ankylostoma Duodenal

                                 

hook worm

Answer
>Infective form:Filariform larva
>Portal of entry:skin
>Migration:through the lung
>Site of location:small intestine

     Life_cycle::
a)Host:Man is the only known definitive host.
b)Stage:
           i)Passage of eggs from the infected host::: the eggs containing unsegmented ova are passed out in the faeces of the human host.
----->
          ii)Development in soil: A rhabdityform larva->molts twice->filariform larva.
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          iii)Intrance into a new host: By penetration of the skin after cast of their sheeth.
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          iv)Migration: Filariform larva in subcutaneous tissue->lymphnode or small venules->venous circulatin->right heart->pulmonary circulation->alveoli->bronchioles->larynx->pharynx->swallowed->stomach->small intestine.
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          v)Localization and laying of eggs: From the small intestine->fourth molting->sexual mature->adult->female adult worm->laying on egg->cycle is completed
----->
           Fresh cycle is repeated after 6weeks interval.
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____________________Ref: Dr. Jahir uddin(MBBS,FCPS).
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