Microbiology 23: Worms And Wiggly Things Flashcards
Give an example of a trematode (fluke) ?
Schistosomiasis
Give an example of a Nematode (roundworm) ?
Ascaris
Which worm has a leaf like shape and buries its way through your liver and into the biliary tract where it lays eggs ?
Trematode (flukes) - Schistosomiasis
Give an example of a Cestode (tapeworm) ?
Taenia Solium (from pigs) Taenia Saginata (from cows)
Which tape worm has dogs as their definitive host ?
What is an accidental host (before getting to the definitive host which is a dog)?
Hydatid
Humans
How do humans get infected by Schistosomiasis?
- Circariae are floating larvae found in contaminated water and can penetrate the human skin
- They travel to venous plexus in bladder or gut. They become worms and start laying eggs (this is the damaging part - eggs can go to liver and cause fibrosis/cirrhosis and also to the bladder)
- Then the eggs are excreted in faeces/urine. The eggs hatch and infect snails. The snails release Circariae which can also infect humans by penetrating the foot.
Which cancer is associated with Schistosomiasis infection ?
Bladder cancer
What is the treatment for Schistosomiasis ?
Praziquantel
How can Ascaris infection present Clinicaly ?
- Malnutrition
- Blood loss- Anaemia
- G.I Obstruction
How are ascaris parasites transmitted to humans ?
Faeco-oral route- You eat the eggs they hatch into worms in the intestines. The worms lay eggs which are excreted in faeces. Eggs reside in soil.
What is the cause of Elephantiasis ?
Lymphatic Filariasis infection (roundworms)
Name 2 vectors of Filariasis ?
Black flies
Mosquitoes
Give 2 examples of how Filariasis infection can be diagnosed ?
Dance sign on ultrasound
Can see the worm migrating across the Eye (loa loa worm)
Which worm can be seen migrating across the eye ?
Loa Loa worm (Filariasis (roundworm))
How does the Tumbu fly transmit myiasis parasite infection in Africa ?
It deposits larvae on clothes hanging on washing lines which then infect human skin.
