Parasite: part 6 Flashcards
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)
Schistosoma
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
