The incidence of malaria is currently increasing worldwide - HSC - SSCE Biology - Question 6 - 2003 - Paper 1

To determine the most effective strategy for reducing the spread of malaria, we need to assess each option based on current research and public health practices.

1. Quarantine all infected people: While quarantining infected individuals may help prevent direct transmission, it does not address the root causes of malaria transmission, which are primarily related to mosquito vectors.

2. Reduce mosquito breeding grounds: This is considered one of the most effective strategies to combat malaria. By eliminating standing water and using insecticides, the reproduction of mosquitoes can be significantly minimized. This directly impacts the potential for malaria transmission.

3. Treat all infected people with high doses of antibiotics: While antibiotics can treat some infections, they are not effective against malaria, which is caused by a parasite (Plasmodium species), not bacteria.

4. Genetically modify human red blood cells to make them malaria-resistant: Although this is a promising area of research, it is not yet a widespread or proven method for malaria control.

Based on this analysis, the correct answer is (B) Reduce mosquito breeding grounds, as it tackles the primary vector responsible for the spread of malaria.