Investigação de fatores sorológicos e genéticos relacionados com a predisposição ao desenvolvimento das formas graves da dengue em Juiz de Fora

Abstract

Dengue virus infection (DENV) is considered the most important arbovirose in the world and the greatest impact on public health. Four different serotypes of DENV: DENV-1, DENV-2, DENV-3 and DENV-4 have been described. DENV infection may produce a wide variety of disorders, dengue fever or severe disease, such as dengue hemorrhagic fever (DHF) and dengue shock syndrome (SCD). Any of the four DENV can cause asymptomatic infection from one to DHF and DSS. The pathogenesis of DHF / DSS is multifactorial and several studies showed some hypotheses to explain the most serious manifestations of infection by DENV: (i) viral factors (ii) secondary infection DENV and (iii) the host factors could be related to exaggerated immune response. Studies trying to understand why dengue patients have different prognoses are of great importance for public health. Although dengue is considered one major public health problem, there are not available antiviral drugs and vaccines to treat or prevent the infection. The vector control has been inefficient, allowing the emergence of new outbreaks. The city of Juiz de Fora has experienced several dengue epidemics in recent years, with the record of serious cases and deaths. Given this context, this study aimed to investigate the serological and genetic factors related to the predisposition to severe forms of dengue in Juiz de Fora. In September/ October 2013 and February to May 14 342 samples of whole blood were collected were collected. Samples were used to investigate the immune response do dengue, SNPs and DENV. In the study group, a seroprevalence of 16.1% was observed. Predisponent and protector genotypes were detected genes FCyRIIa, JAK-1 and DCSIGN in Juiz de Fora residents, however, there was no association of these genotypes individually and / or in combination with the gender distribution, different Juiz de Fora regions where the participants lived and report presentation of dengue symptoms by patients. Three patients were detected with DENV infection, by the time of sample collection.The knowledge of areas and persons who are more prone to have FHD is a valuable information from the epidemiological point of view and the structuring of public policies aimed at controlling dengue.