Ancylostoma duodenale Life cycle
Ancylostoma duodenale completes it's life cycle in single host.
Man is the only definitive host. No intermediate host is required.
Infection can occur filariform larvae found in soil, in man capable of penetrating unbroken of skin, this infective stage of parasite.
When person walks barefood on soil containing filariform larvae, they penetrate skin.
On reaching subcutaneous tissue larvae enter into lymphatics or small venules.
Then in lymphatic system and in right side of heart, larvae originate into pulmonary circulation, where they increase in size.
Larva enter alveoli of lung, from lung alveoli larvae crawl in bronchus and reach treachea.
Trachea pushes larvae in pharynx, then larvae is swallowed by pharynx, passed through esophagus and then from stomach enters into small intestine.
In small intestine, larvae undergo develop into adult worm.
They attach themselves to small intestine by their mouth parts.
Female fertilized and they start discharging egg in stool.
Rhabditiform larvae comes out from egg in soil and undergo two mouth in soil, then produce infective filariform larva and life cycle is thus repeated.
0 Comments