“The work directed against mosquitoes carrying yellow fever had an equally good effect upon malaria, especially when anti-anopheles work was extended to the suburbs of the city. Before the year 1901 Havana had yearly from 300 to 500 deaths from malaria, rising as high in 1898 as 1,900 deaths. Since 1901 there has been a steady decrease in the malaria death rate until 1912, when there were only four deaths. Four deaths from malaria in a city in the tropics the size of Havana, about 300,000 population, means the extinction of malaria in that city.”
Book:Sanitation in Panama