Publications by authors named "Frederico S V Malta"

Background: The rapid spread and increase of chikungunya (CHIKV) and dengue (DENV) cases in Brazilian regions in 2023 has raised concerns about the impact of arboviruses on public health. Epidemiological and genomic surveillance was performed to estimate the introduction and spread of CHIKV and DENV in Brazil.

Methods: This study obtained results from the Hermes Pardini (HP), a private medical laboratory, and the Health Department of Minas Gerais state (SES-MG).

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Article Synopsis
  • - SARS-CoV-2 reinfections are occurring globally, with significant increases seen during the rise of the Omicron variant, prompting concerns about how often COVID-19 is being contracted a second time.
  • - An analysis in Brazil from April 2020 to August 2022 identified 11,669 reinfection cases out of 324,979 confirmed COVID-19 cases, concentrated mainly in Minas Gerais, São Paulo, Rio de Janeiro, and Goiás.
  • - The study found a reinfection rate of approximately 8%, highlighting two patterns: shorter reinfection intervals (up to 200 days) and longer ones (more than 500 days), indicating the changing dynamics of COVID-19 as new variants emerge.
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The introduction of SARS-CoV-2 variants of concern (VOCs) in Brazil has been associated with major impacts on the epidemiological and public health scenario. In this study, 291,571 samples were investigated for SARS-CoV-2 variants from August 2021 to March 2022 (the highest peak of positive cases) in four geographical regions of Brazil. To identify the frequency, introduction, and dispersion of SARS-CoV-2 variants in 12 Brazilian capitals, VOCs defining spike mutations were identified in 35,735 samples through genotyping and viral genome sequencing.

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Brazil currently ranks second in absolute deaths by COVID-19, even though most of its population has completed the vaccination protocol. With the introduction of Omicron in late 2021, the number of COVID-19 cases soared once again in the country. We investigated in this work how lineages BA.

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Brazil is one of the nations most affected by Coronavirus disease 2019 (COVID-19). The introduction and establishment of new virus variants can be related to an increase in cases and fatalities. The emergence of Omicron, the most modified SARS-CoV-2 variant, caused alarm for the public health of Brazil.

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  • The Gamma variant of COVID-19, first identified in Brazil, has been linked to higher infection rates, hospitalizations, and fatalities, especially during a surge in Minas Gerais in March-April 2021.
  • A surveillance study analyzed 1,240 COVID-19-positive samples across 305 municipalities, finding that Gamma was the most prevalent variant (71.2%), followed by Zeta (12.4%) and Alpha (9.6%).
  • The study emphasizes the necessity of vaccination to mitigate severe cases and deaths, noting no significant mortality differences among the different variants identified.
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  • The study investigates the spread of the Delta variant of SARS-CoV-2 in Minas Gerais, Brazil, highlighting its introduction and dominance, which reached 70% of cases within 8 weeks during mid 2021.
  • Using PCR genotyping and genome sequencing, it is shown that Delta is more transmissible than the earlier Gamma variant, but this increase in transmissibility did not lead to a rise in cases or deaths, likely due to vaccination efforts.
  • The research also identifies Rio de Janeiro as the primary source for the Delta variant's spread in Minas Gerais, suggesting effective control measures despite the heightened transmissibility of the variant.
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Coronavirus disease 2019 (COVID-19) pandemic has caused immeasurable impacts on the health and socioeconomic system. The real-time identification and characterization of new Variants of Concern (VOCs) are critical to comprehend its emergence and spread worldwide. In this sense, we carried out a national epidemiological surveillance program in Brazil from April to October 2021.

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The emergence of diverse lineages harboring mutations with functional significance and potentially enhanced transmissibility imposes an increased difficulty on the containment of the SARS-CoV-2 pandemic [...

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Cases of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in Manaus, Brazil, resurged in late 2020 despite previously high levels of infection. Genome sequencing of viruses sampled in Manaus between November 2020 and January 2021 revealed the emergence and circulation of a novel SARS-CoV-2 variant of concern. Lineage P.

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Cases of SARS-CoV-2 infection in Manaus, Brazil, resurged in late 2020, despite high levels of previous infection there. Through genome sequencing of viruses sampled in Manaus between November 2020 and January 2021, we identified the emergence and circulation of a novel SARS-CoV-2 variant of concern, lineage P.1, that acquired 17 mutations, including a trio in the spike protein (K417T, E484K and N501Y) associated with increased binding to the human ACE2 receptor.

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Background: KRAS is the most frequently mutated oncogene in cancer, however efforts to develop targeted therapies have been largely unsuccessful. Recently, two small-molecule inhibitors, AMG 510 and MRTX849, have shown promising activity in KRAS G12C-mutant solid tumors. The current study aims to assess the molecular profile of KRAS G12C in colorectal (CRC) and non-small-cell lung cancer (NSCLC) tested in a clinical certified laboratory.

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Hereditary hemochromatosis is known as the most common genetic disorder among individuals of European genetic background. It is possible to find 2 mutations closely placed in the HFE gene (H63D and S65C) and this proximity can cause errors when genotyped by real-time polymerase chain reaction (PCR) genotyping assay. The aim of this study was to develop a hydrolysis probe-based PCR assay for detection of the H63D and S65C mutations without interference from on each other.

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We have reported the allele frequencies of 15 STR loci, including the original 13 CODIS core loci, in over 100,000 Brazilian individuals. A new CODIS core loci has been proposed, but the recently established Brazilian Integrated Network of DNA Databases made a decision in 2010 to postpone the implementation of this new set of loci due to the lack of allele frequency data for the Brazilian population. We aimed to report allele frequencies of 20 loci, estimated from 96,400 Brazilian individuals undergoing paternity testing during 2011-2013.

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The Brazilian population is one of the most heterogeneous populations of the world, formed mainly by an admixture of European, African and Native American populations. Brazil is the fifth largest country in the world (8,511,960 km(2)), being divided into five geographical regions. This study provides population genetic data of up to 137,161 unrelated individuals representing the entire Brazilian territory.

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This study provides population genetic data for individuals of Vitoria, Espirito Santo, Brazil, a location not yet characterized for STR frequencies used for genetic identification studies. Allelic frequencies and other population data analysis are reported for the 15 autosomal-STR loci included in the PowerPlex(®)16 kit (CSF1PO, D13S317, D16S539, D18S51, D21S11, D3S1358, D5S818, D7S820, D8S1179, FGA, Penta D, Penta E, TPOX, TH01 and vWA). Allele and haplotype frequencies, gene diversity and discrimination capacity were also estimated for the PowerPlex(®) Y System (DYS19, DYS385, DYS389I/II, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438 and DYS439).

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Allelic frequencies and other population data analysis are reported for the 15 autosomal Short Tandem Repeats (STR) loci included in the PowerPlex(®)16 kit (CSF1PO, D13S317, D16S539, D18S51, D21S11, D3S1358, D5S818, D7S820, D8S1179, FGA, Penta D, Penta E, TPOX, TH01 and vWA) in Pomeranian's descendants from the Espirito Santo State (ES), Brazil, third largest population of Pomeranian's descendants in the world. They chose the mountain region of the state for their preferred geographic location, and they have a very peculiar lifestyle with a selective mating behavior which has maintained their characteristics as a relatively pure subpopulation. Blood samples were obtained from 82 unrelated volunteers from 11 different cities of Espirito Santo State, where there are the Pomeranian's descendants.

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