How are people fighting the spread of malaria in sub saharan africa?

There is a vaccine available for malaria but it requires four injections and is only about 25 to 50% effective. The most effective way would then be to distribute bed nets as this would help to prevent or reduce the amount of times individuals would get bitten. 

Explanation:

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when the united states took over

answer; john stuart mill's principle of utility is your answer; /// good luck