Question

A housefly sits on garbage and then on uncovered sweets in a shop. In spreading disease, the housefly acts as a

All microorganisms cause diseases in human beings.

What is the difference between a vector and a carrier of disease? Give one example of each.

After the monsoon, many families in a housing colony fell ill with dengue, though the colony's tap water was clean. Residents found water collected in old tyres, flower-pot trays and air coolers. Explain why dengue spread, and suggest three steps residents and the municipality should take.