RESUMO
BACKGROUND The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants has become a major concern contributing to increased morbidity and mortality worldwide. OBJECTIVES Here we describe the replacement of the Gamma variant of concern (VOC) with Delta in the western Brazilian Amazon. METHODS In this study, we analysed 540 SARS-CoV-2 positive samples determined by qualitative real-time RT-PCR selected in the state of Rondônia between June and December 2021. The positive cohort was sequenced through next-generation sequencing (NGS) and each sample was quantified using real-time RT-qPCR, the whole genome sequence was obtained, SARS-CoV-2 lineages were classified using the system Pango and the maximum likelihood (ML) method was used to conduct phylogenetic analyses. FINDINGS A total of 540 high-quality genomes were obtained, where the Delta VOC showed the highest prevalence making up 72%, with strain AY.43 being the most abundant, while the Gamma VOC was present in 28%, where the P.1 strain was the most frequent. In this study population, only 32.96% (178/540) had completed the vaccination schedule. MAIN CONCLUSIONS This study highlighted the presence of Gamma and Delta variants of SARS-CoV-2 in RO. Furthermore, we observed the replacement of the Gamma VOC with the Delta VOC and its lineages.
RESUMO
Anticorpos, agentes empregados no desenvolvimento de pesquisas biomédicas, no diagnóstico e na terapêutica, possuem elevada capacidade de interação aos mais variados ligantes, Estruturalmente são heterotetrameros constituídos por duas cadeias leves e duas cadeias pesadas com massa molecular de aproximadamente 150 kDa, Visando melhorar as características farmacocinéticas e minimizar possíveis reações adversas desencadeadas por imunoglobulinas de origem não humana, a engenharia molecular de anticorpos vem obtendo fragmentos de anticorpos como porções Fab, F(ab?)2, scFv e Fv, Em adição aos anticorpos convencionais, camelídeos produzem imunoglobulinas funcionais desprovidas de cadeia leve, onde o domínio variável da cadeia pesada, denominado VHH ou nanocorpo, é responsável pelo reconhecimento antigênico, Apresentando características adequadas ao desenvolvimento de fármacos com alta capacidade de neutralização, fragmentos VHHs vêm sendo propostos para uso em imunoterapia passiva ou em drug-delivery, No diagnóstico esses fragmentos podem ser aplicados na construção de biosensores ou na imagiologia, atuando na detecção de células cancerígenas, no monitoramento de tumores ou em alterações celulares...
Antibodies, agents employed for the development of biomedical research, diagnostic and therapeutic, have high ability to interact with different ligands. Structurally are heterotetramers constituted by two light and two heavy chains, with molecular weight of approximately 150 kDa. Aiming to improve the pharmacokinetic properties and minimize possible adverse reactions triggered by immunoglobulins of non-human origin, the molecular engineering of antibodies has been obtaining fragments of antibodies, such as Fab, F(ab?)2, Fv and scFv. In addition to the conventional antibodies, camelids produce functional immunoglobulins devoid of light chain, in which the variable domain, named VHH or nanocorpo, is able to recognize the antigen. With appropriate characteristics for the development of drugs with high neutralizing capacity, VHH fragments have been proposed for use in passive immunotherapy or drug-delivery. To the diagnosis, these fragments can be used to construct biosensors, in the imagiology , acting in the detection of cancer cells, tumor monitoring or cell changes...