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Flashcards in Parasite: part 6 Deck (16)
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How do Loaiasis cause eye worms

Females (~7cm) migrate through the subcutaneous tissues, may cross the front of the eye under the conjunctiva.  so you see something wriggling in your vision


Example of flatworm (cestodes)

Taenia (Tapeworms)


T/F humans are the only definitive host for tapeworm, therefore they do not catch it from animals

F.... they catch from pig and beef. Humans are the only DEFINITIVE host, but doesn't mean it cannot live in other hosts temporarily between transfer


Symptoms of taenia infections

Most people => no symptoms or mild symptoms. abdominal pain, loss of appetite, weight loss, and upset stomach. Active passing of tapeworm segments


How long are the taenia flat worms

T. saginata taeniasis (size of the worm up to 10m) T. solium or T. asiatica (~3 m). T. saginata often experience more symptoms


Diagnosis adn treatment of taenia

Diagnosis: Segment in stool or identifcation of eggs in stool Treatment: praziquantel


T/F for taeni, the eggs of the flatworm must be transferred directly from animal to human

F The eggs can survive for days to months in the environment


What is cysticercosis

TAENI SOLIUM Commonest acquired cause of epilepsy worldwide


Example of fluke worm (=trmatodes)



Why is schistosomasis life cycle complex

Involves snail. In water, the eggs hatch and penetrate snail They are then released from snail and penetrate the skin They migrate through different tissues and transform into male and female and eventually reside in venules. Eggs moved towards lumen of SI and bladder/uterus


Symptoms, diagnoss and treatment of schistosomiasis

Symptoms: rash/itchy skin. Fever, chills etc. after couple of months Adult worms, eggs travel to intestine, liver or bladder, cause inflammation or scarring Diagosis stool Treatment praziquantel


Ectoparasite examples

Sarcoptes scabeie (scabies) Pediculus humanus capitis (head louse), Pediculus humanus corporis (body louse, clothes louse), and Pthirus pubis ("crab" louse, pubic louse)


Treatment for scabies and diagnosis

Diagnostic Appearance of rash + presence of burrows Treatment Scabicides


Stages of lifecycle for ectoparasites and route of infection

Three stages: eggs, nymphs and adult Transmission by direct contact


How are most diarrhoeal protozoal diseases diagnosed?

Stool examination


In which subset of the population is there a significant burden of worms?

School-aged children – this has a massive impact on their development