(a(A))[1]
The disease-causing organism is a virus.
(a(B))[1]
The disease-causing organism is a prokaryote.
(a(C))[1]
The disease spreads through the faecal-oral route, for instance when sewage carrying the pathogen pollutes drinking water.
(a(D))[1]
The disease-causing organism spends part of its life cycle inside an insect, and that insect acts as a vector for the disease.
(a)[1]
The disease-causing organism is a virus.
(b)[1]
The disease-causing organism is a prokaryote.
(c)[1]
The disease spreads through the faecal-oral route, for instance when sewage carrying the pathogen pollutes drinking water.
(d)[1]
The disease-causing organism spends part of its life cycle inside an insect, and that insect acts as a vector for the disease.