Leela has typhoid, and a doctor treats her…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Leela has typhoid, and a doctor treats her. She recovers, goes back to her house beside an open drain and drinks unboiled water. A month later she has typhoid again. Explain what happened. Say what should be done to stop it from happening again.
Need a reminder? The key ideaShow
Most diseases have an immediate cause, usually a microbe, and contributory causes such as poor nutrition, unclean surroundings, crowded homes, harmful habits and inherited traits. Infectious diseases are caused by microbes and can spread; non-infectious diseases such as cancer and high blood pressure have internal causes.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The immediate cause. The doctor treated the typhoid, which is caused by bacteria.
Step 2. The contributory causes. The open drain and the unboiled water were not changed. They bring the bacteria back.
Step 3. What to do. The family should drink clean, boiled water, and the drain should be covered or cleared.
Answer: treatment removes the immediate cause, but the contributory causes stayed. To prevent the disease we must correct them too.
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