Where is Hymenolepis nana found?

Where is Hymenolepis nana found?

The dwarf tapeworm or Hymenolepis nana is found worldwide. More common in warm parts of South Europe, Russia, India, US and Latin America.

Does Hymenolepis nana spread?

H. nana infections are much more common than H. diminuta infections in humans because, in addition to being spread by insects, the disease can be spread directly from person to person by eggs in feces. When this happens, H.

What is a major morphological difference between hymenolepis Diminuta and Hymenolepis nana?

diminuta may be distinguished from R. nana by its greater size, being 20 to 60 mm in length and 3 to 4 mm in width; and its having a small pear-shaped scolex bearing four deep suckers with an unarmed rostellum Fig. 13-11).

What is the mode of transmission of Hymenolepis nana?

Hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus Hymenolepis and species nana. This infection does not require an intermediate host and infection can occur directly from one infected person to another by fecal-oral transmission.

What is the source of infection of hymenolepis Nana?

One becomes infected by accidentally ingesting dwarf tapeworm eggs. This can happen by ingesting fecally contaminated foods or water, by touching your mouth with contaminated fingers, or by ingesting contaminated soil.

What is the mode of transmission of Dipylidium Caninum?

For Dipylidium caninum, the intermediate hosts are fleas and lice. Thus this species of tapeworm can be readily transmitted by ingestion of arthropods that are canine parasites in and of themselves.

What is the infective stage of H Nana?

nana, and humans can become infected with the latter by direct ingestion of eggs. Within the arthropod host, the eggs develop into cysticeroids, which can infect the mammalian host upon ingestion and develop into adults in the small intestine.

Does H Nana have an intermediate host?

H. nana has 3 modes of infection: Indirect 2-host cycle: Rodents are the primary definitive hosts, and grain beetles, fleas, or other insects feed on contaminated rodent droppings as intermediate hosts; humans can become infected by ingesting parasitized insects.