Association between polymorphisms in , and genes and covid-19 severity in Southern Brazil.

Background: A distinct phenotype in Coronavirus disease 2019 (Covid-19) was observed in severe patients, consisting of a highly impaired interferon (IFN) type I response, an exacerbated inflammatory response.

Objective: The aim of the present study was to investigate a possible association of single nucleotide polymorphisms (SNPs), in five genes related to the immune response, rs3775291 in ; rs2292151 in ; rs1758566 in ; rs1800629 in , and rs1800795 in with the severity of Covid-19.

Methods: A cross-sectional study was performed, with non-severe and severe/critical patients diagnosed with Covid-19, by two public hospitals in Brazil.

, and Variants in Zika Virus Transmission from Mother to Child in a Population from South and Southeast of Brazil.

During the 2015-2016 epidemic, Brazil was the country with the highest rate of Zika virus (ZIKV) infection in the Americas. Twenty-nine percent of pregnant women positive for ZIKV exhibited ultrasound scans with fetus anomalies. Human leukocyte antigen-G (HLA-G) exerts immunoregulatory effects by binding to inhibitory receptors, namely LILRB1 and LILRB2, thus preventing mother-fetus rejection and vertical pathogen transmission.