Parasitic Inverterbrates

Question 1

Helminths

Answer 1

Multicellular

Have complicated lifestyles

They transfer between hosts during their larval stage otherwise they’ll be too big to be transmitted as adults

Larva are often taken in with food

Question 2

Tapeworm

Answer 2

They were used as slimming agents during victorians

Ingested by eating uncooked meat. Beef and pork tapeworms

Intermediate hosts will suffer worse symptoms than definitive host

Question 3

Round worms

Answer 3

Very common in the uk and in children under 2

Eggs are infested by humans

Larvae hatches in small intestine and migrate to large intestine for the adult to develop

Females will lay their eggs in perianal area causing irritation around anus and sometimes vagina

Question 4

Round worms diagnosis

Answer 4

Worms may be visible

Sellotape slide viewed under microscope

Treatment: mebendazole

Question 5

Tapeworm diagnosis and treatment

Answer 5

Diarrhoea

Weight loss

Proglotids and eggs a can be detected in poo

Beef and pork should be cooked thoroughly

Question 6

Schistosomiasis

Answer 6

Humans are affected during larval stage

The cercariae can penetrate the skin

Question 7

Schistosomiasis diagnosis

Answer 7

Eggs can be found in urine or faeces