Question

How does using toilets instead of defecating in the open help prevent diseases in a village?

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.

Classify the following diseases according to how they mainly spread — through air, through contaminated food and water, through insect vectors, or by direct contact: tuberculosis, cholera, malaria, ringworm, hepatitis A, common cold, dengue. Suggest one preventive measure for the air-borne group.

A town health centre recorded the number of dengue cases from April to September. The data is shown in the bar graph. The monsoon in this town lasts from mid-June to mid-September.