Brazil’s efforts to reduce the incidence of diseases transmitted by the Aedes aegypti mosquito have yielded positive results. Recent data released by the Ministry of Health reveal that the number of zika and chikungunya cases decreased between 2017 and 2018, while dengue cases remained stable.
By November 2018, there were 7,544 reported cases of zika nationwide, a 54% drop compared to the same period in 
2017 (16,616). In the case of chikungunya, the number of reported cases fell to 82,382, a 55% reduction compared to the previous year (183,281). Among the three main diseases caused by the mosquito, only dengue saw a slight increase, from 226,675 in 2017 to 228,042 reported cases by the beginning of last month.
According to the Ministry of Health, preventive actions and increased resources to combat Aedes have been crucial in reducing the number of reported cases of these diseases.