The number of people diagnosed with dengue fever which is contracted from the bite of an infected mo...........

English ( Master) Reading Comprehension (C)

The number of people diagnosed with dengue fever (which is contracted from the bite of an infected mosquito) in North India this year is twice the number diagnosed last year. The authorities have concluded that measures to control the mosquito population have failed in this region.

Question: All of the following, if true, would cast doubt on the authorities’ conclusion except

more cases are now reported because of increases in administrative efficiency

a very high proportion of the cases were in people who had recently returned from neighboring countries

an effective diagnostic test was introduced about nine months ago

the incidence (number of cases per thousand) of malaria, also contracted from mosquito bites, has increased

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Explanation:

- Option 1: More cases are now reported because of increases in administrative efficiency.

- This suggests that the increase in numbers might be due to better reporting, not necessarily a failure in controlling mosquitoes.

- Option 2: A very high proportion of the cases were in people who had recently returned from neighboring countries.

- This implies that the source of infection might be external, affecting the conclusion that measures have failed locally.

- Option 3: An effective diagnostic test was introduced about nine months ago.

- Accurate diagnostics would likely lead to more reported cases, not necessarily reflecting a failure in control measures.

- Option 4: The incidence (number of cases per thousand) of malaria, also contracted from mosquito bites, has increased.

- This supports the idea that mosquito control measures have failed, as it indicates a general increase in mosquito-borne diseases due to biting mosquitoes.

The correct answer is Option 4.