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. SARSCoV2 SARSCoV SARS CoV (SARS-CoV-2 worldwide (VOC Amazon 54 SARS-CoV- realtime real time RTPCR RT PCR 2021 nextgeneration next generation NGS (NGS RTqPCR, RTqPCR qPCR, qPCR RT-qPCR obtained ML (ML analyses highquality high quality 72 72% AY43 AY 43 AY.4 abundant 28 28% P1 P 1 P. frequent population 3296 32 96 32.96 178/540 178540 178 (178/540 schedule RO Furthermore (SARS-CoV- 5 SARS-CoV 202 7 AY4 4 AY. 329 3 9 32.9 178/54 17854 17 (178/54 (SARS-CoV 20 32. 178/5 1785 (178/5 178/ (178/ (178 (17 (1 (

RESUMO Objetivo descrever o perfil de crianças pré-termo, segundo aspectos sociodemográficos, clínicos e assistenciais, e a associação com dados perinatais e pós-natais. Métodos estudo observacional descritivo transversal, aprovado pelo Comitê de Ética em Pesquisa da Universidade Federal de Minas Gerais – CEP-UFMG, sob o Parecer 3.615.440, realizado por meio da análise de 749 prontuários de crianças pré-termo, atendidas no setor de Fonoaudiologia de ambulatório multidisciplinar de follow-up. Foram incluídos no estudo todos os prontuários do período de 2009 a 2019. Para as análises de associação foram utilizados os testes Qui-quadrado de Pearson e Kruskal-Wallis, sendo considerados como valores com significância estatística os que apresentaram valor de p≤0,05. Resultados verificou-se distribuição similar entre os sexos feminino e masculino e a maior parte das crianças com prematuridade moderada a tardia. A maioria dos pais apresentou ensino médio completo, com renda familiar de até dois salários mínimos (60,0%). Quanto aos aspectos clínicos, observou-se significância estatística (p≤0,001) na associação da idade gestacional com as seguintes variáveis: peso ao nascimento, estatura, perímetro cefálico, uso do Método Canguru, alimentação na alta, drogas ototóxicas, hemorragia intracraniana, sepse e icterícia. A maioria dos bebês (99,9%) realizou o Teste Guthrie com resultado adequado (95,3%). Da mesma forma, referente à realização da Triagem Auditiva Neonatal - (79,9%), com resultado adequado (89,4%). Conclusão a maioria das famílias era de baixa renda, com bebês apresentando prematuridade tardia. Observou-se significância estatística para as variáveis: tipo de parto, peso, estatura, perímetro cefálico, uso de drogas ototóxicas, hemorragia intracraniana, sepse e icterícia, com alterações predominantes em prematuros extremos.

ABSTRACT Purpose to describe the profile of preterm children based on sociodemographic, clinical, and assistance aspects, and their association with peri- and postnatal data. Methods observational, descriptive, cross-sectional study, approved by the Research Ethics Committee of the Universidade Federal de Minas Gerais (UFMG, Brazil), under evaluation report no. 3,615.440. It was based on the analysis of 749 medical records of preterm children attended at the speech-language-hearing department of a multidisciplinary follow-up outpatient center. All medical records from 2009 to 2019 were included in the study. The association analyses were made with the Pearson chi-square and Kruskal-Wallis tests, and the statistically significant values were set at p≤0.05. Results the sample was evenly distributed between females and males, and most of them were moderate-to-late premature children. Most parents had graduated from high school, earning up to two minimum wages (60.0%). As for the clinical aspects, there was a statistically significant association (p≤0.001) between gestational age and birth weight, length, head circumference, use of kangaroo care, feeding method at discharge, ototoxic drugs, intracranial hemorrhage, sepsis, and jaundice. Most babies (99.9%) were submitted to the Guthrie test, with normal results (95.3%). It was likewise with the Neonatal Hearing Screening (79.9%), with normal results (89.4%). Conclusion most of the sample were from low-income families, with late premature babies. There was a statistical significance for type of delivery, weight, length, head circumference, ototoxic drug use, intracranial hemorrhage, sepsis, and jaundice, with changes occurring predominantly in extremely premature infants.