Archive

Category Archives for "Parasitology"

Giardia duodenalis: Morphology, Life Cycle, Pathogenesis

Giardia duodenalis (Giardia intestinalis/ Giardia lamblia) is a flagellated parasitic microorganism. It is the only pathogenic protozoan found in the duodenum and jejunum of humans. It is the cause of disease, known as giardiasis which is actually infection of the small intestine. It is found throughout the world. Giardiasis is the most common water-borne, parasitic […]

Continue reading

Wuchereria bancrofti: Morphology, Life Cycle and Pathogenesis

Wuchereria bancrofti is a filarial nematode worm. Adult Wuchereria bancrofti lives in lymphatic vessels and lymph nodes of human and cause lymphatic filariasis. It causes diseases together with Brugia malayi and B. timori.  Various mosquitoes are responsible to spread the filarial worms. It affects over 120 million people throughout the world. If infected people do […]

Continue reading

Strongyloides stercoralis: Morphology, Life Cycle and Pathogenesis

Strongyloides stercoralis is a nematode parasite which belongs to the family Strongylidae under order Rhabditida. It is a human pathogenic parasite which causes disease, known as strongyloidiasis. The parasite is also known as threadworm causing infection with fecal contamination of soil or water.  It is rare in developed countries while in the developing countries, it […]

Continue reading

Nematodes: Characteristics and Classification

The nematodes are also known as roundworms. They belong to the phylum Nematoda. They are a diverse group of animal organisms found in a broad range of environment. Some are free living in soil, marine and freshwater; some make parasitic life in animals and plants body.General Characteristics of NematodesThey are unsegmented worms. They are elongated […]

Continue reading

Enterobius vermicularis: Morphology, Life Cycle and Pathogenesis

Enterobius vermicularis is commonly known as threadworm and pinworm. It is found all over the world. Infection of Enterobius vermicularis in human is known as enterobiasis. It is worldwide in distribution. Particularly, it is common in children.  Generally, the mature females live in the vermiform appendix and caecum.Systematic PositionPhylum: NematodaClass: ChromadoreaOrder: RhabditidaFamily: OxyuridaeGenus: EnterobiusSpecies: Enterobius vermicularisMorphologyIt […]

Continue reading

Ancyclostoma duodenele: Morphology, Life Cycle and Pathogenesis

Ancyclostoma duodenele is a parasitic nematode worm which is commonly known as old world hookworm. The anterior end of the worm is bent dorsally and thus the name hook worm. It has wide geographical distribution but mostly found in tropical regions. The adult worms live in the small intestine particularly in jejunum, less often in […]

Continue reading

Ascaris lumbricoides: Roundworm

The worm is known as roundworm. It is present all over the world where environmental hygiene is low. The adult worm lives in the lumen of small intestine of human. About 807 million to 1.2 billion people are infected with Ascaris lumbricoides throughout the world. Among them, 10 percent people is infected in the developing […]

Continue reading

Echinococcus granulosus: Morphology, Life Cycle and Pathogenesis

Echinococcus granulosus is a parasitic worm which belongs to the family Taeniidae under order Cyclophyllidea of class Cestoda. It is also known as Dog tapeworm, Hydatid worm or Hyper-tape worm. It is found all over the world. The larval form causes hydatid disease in man. This disease is also known as human echinococcosis or hydatidosis. […]

Continue reading

Taenia solium: Morphology, Life Cycle and Pathogenesis

Taenia solium is a parasitic organism which belongs to the family Taeniidae under order Cyclophyllidea of class Cestoda. It is also known as the pork tapeworm. It is occurred amongst the pork eaters all over the world. It is the armed tapeworm of human. Adult worm lives in the small intestine (upper jejunum) of human.Systematic […]

Continue reading