Question

After a flood in a village, many people fell ill with severe diarrhoea and vomiting, which doctors identified as cholera. The most likely way it spread was through

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.