A)are commonly associated with the consumption of shellfish.
B)are spread by the faecal-oral route.
C)require a low infective dose.
D)can be spread on contaminated fomites.
E)all of the above.

A)recently travelled overseas.
B)received broad spectrum antibiotic therapy.
C)lived in a developing country.
D)consumed contaminated animal products.
E)extremely poor personal hygiene.

A)is motile because it has a flagellum.
B)forms cysts that are resistant to chlorine.
C)produces symptoms of persistent diarrhoea and nausea.
D)is treated with metronidazole.
E)all of the above.