High SARS-CoV-2 seroprevalence in persons experiencing homelessness and shelter workers from a day-shelter in São Paulo, Brazil.

Brazil presents one of the highest COVID-19 death tolls in the world. The initial SARS-CoV-2 epicenter was São Paulo city. As of 2019, the homeless population of São Paulo city was estimated at 24,344 individuals, the largest national homeless population.

The Contribution of Coinfection and Intestinal Inflammation to Cecal Colonization and Systemic Spread of Typhimurium Deficient in Tetrathionate Reductase or Type III Secretion Systems Pathogenicity Island 1 or 2.

Intestinal inflammation may provide a growth advantage for and enhance its systemic spread in chickens. triggers intestinal inflammation in the host by using type III secretion systems (T3SS) and produces the inflammatory end product tetrathionate. In mice, tetrathionate respiration confers a growth advantage for Typhimurium over the competitive microbiome in the inflamed intestine.

Detection of and phylogenetic studies with avian metapneumovirus recovered from feral pigeons and wild birds in Brazil.

The aim of the present study was to determine whether avian metapneumovirus (aMPV)-related viruses were present in wild and synanthropic birds in Brazil. Therefore, we analysed samples from wild birds, feral pigeons and domestic chickens in order to perform a phylogenetic comparison. To detect the presence of aMPV, a nested reverse transcriptase-polymerase chain reaction was performed with the aim of amplifying a fragment of 270 bases for subtype A and 330 bases for subtype B, comprising the gene coding the G glycoprotein.

Genotypes and clinical data of respiratory syncytial virus and metapneumovirus in brazilian infants: a new perspective.

The aim of this study was to determine if there was a correlation between respiratory syncytial virus (RSV) and metapneumovirus (MPV) genotypes and clinical data of Brazilian infants hospitalized for acute lower respiratory infection. The viruses in the patients' nasopharyngeal secretions were studied using the polymerase chain reaction and phylogenetic analysis. The study assessed 144 infants; 31.

Genetic variability in the G protein gene of human respiratory syncytial virus isolated from the Campinas metropolitan region, Brazil.

Human respiratory syncytial virus (hRSV) is recognized as the most important viral agent of serious respiratory tract diseases in the pediatric population worldwide. A prospective study for hRSV was conducted in children ageing less than 1 year admitted in two university hospitals in Campinas, São Paulo, Brazil. The aim of the present study was to investigate the genetic variability of both A and B subgroups of hRSV isolated during an epidemic period in the Campinas metropolitan region, Brazil, by sequencing a variable region of the G protein gene.

Variant isolates of human metapneumovirus subgroup B genotype 1 in Campinas, Brazil.

Background: Human metapneumovirus (HMPV) is a paramyxovirus associated with respiratory illness. The genotypes of HMPV isolates in Brazil have not been well characterized.

Objectives: To investigate the presence of HMPV in clinical samples collected from pediatric patients of two university hospitals in the region of Campinas (São Paulo, Brazil) and to genotype them by partial sequencing of the HMPV F gene.