Diseases transmitted by hematophagous insects, mainly Culicidae and Phlebotominae, continue
to create major public health problems, especially in the tropical and subtropical regions of the
world. Despite efforts to control vector populations, the incidence of arboviruses, protozooses
and helminths has increased significantly in the last two decades. Estimates by the World Health
Organization (WHO) indicate that mosquito-borne diseases are among the leading causes of
morbidity and mortality in developing countries. The objective of this paper is to analyze the
impact of the use of malathion EW 44% on the control of dengue in the state of Tocantins, from
January 2014 to October 2019. To this end, a descriptive study was conducted, based on data
from insecticide releases, complementing with the records of the probable cases of dengue
registered in the epidemiological bulletins of the State of Tocantins of the period referred to
above. Statistical analyzes were performed using the Windows Excel program version 10 and
the Statistical Package for the Social Sciences (SPSS) version 21. In the discussion of this study
we described the impact of dengue resulting from spatial spraying with 44% malathion EW
performed in the state. The lack of a tool for monitoring and evaluating the quality of the
execution of spatial sprays performed in the municipalities was also noted, as well as the
monitoring of the susceptibility of the vectors related to the insecticide used.
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