GED Science TestLife ScienceMedium
A public health official is investigating a sudden increase in cases of a mosquito-borne illness in a rural area. The official recommends a multi-pronged approach to control the spread. Which of the following strategies would be the LEAST effective in preventing the transmission of this disease?
- ADistributing insecticide-treated bed nets to residents.
- BEncouraging residents to use personal insect repellents.
- CDraining stagnant water sources where mosquitoes breed.
- DImplementing a widespread vaccination program for the human population.
Show answer & explanationAnswer & explanation
Correct answer: D. Implementing a widespread vaccination program for the human population.
While vaccinations are highly effective for many diseases, for a *sudden increase* in a *mosquito-borne illness*, developing and deploying an effective vaccine typically takes significant time and resources, making it the least immediate and effective strategy compared to direct vector control measures.
Why the other options are wrong
- A. Bed nets directly prevent mosquito bites during sleep, a critical time for transmission.
- B. Insect repellents offer personal protection against bites, reducing exposure.
- C. Eliminating breeding sites is a fundamental and highly effective method of controlling mosquito populations and thus disease transmission.
Vector-Borne Disease Control
Vector-borne diseases are transmitted by vectors (e.g., mosquitoes, ticks). Control strategies focus on breaking the chain of transmission, often by targeting the vector or protecting humans from bites.
- Focus on vector control (e.g., reducing breeding sites).
- Personal protection (e.g., repellents, nets) is crucial.
- Vaccination, if available, is a long-term preventive measure.
- Early detection and treatment of cases also reduce spread.
Memory trick: Stop the bite, ditch the water, then maybe vaccinate later!