Background: SARS-COV2 appears less frequently and less severely in the pediatric population than in the older age groups. There is a need to precisely estimate the specific risks for each age group to design health and education policies suitable for each population.Objective: This study aimed to describe the risk of death in SARS-COV2 infected subjects by age group and according to the presence of comorbidities.Methods: We analyzed data of confirmed SARS-COV2 infection cases where symptoms began between February 22th, 2020, and April 18th, 2021, as published by the General Epidemiology Direction (DGE) of the Mexican Ministry of Health. We calculated COVID-19 incidence and mortality by age group using population data from the Statistics and Population National Institute (INEGI), and estimated the association between risk of death and the presence of comorbidities.Results: Mortality in SARS-COV2 infected people varied considerably, between 7 and 155 deaths per million per year in the under-20 age groups compared to 441 to 15,929 in the older age groups. Mortality in pediatric populations is strongly associated with comorbidities (OR: 4.6-47.9) compared to the milder association for older age groups (OR: 3.16–1.23).Conclusion: The risk of death from SARS-COV2 infection in children is low and is strongly associated with comorbidities.

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Microbiomes are defined as complex microbial communities, which are mainly composed of bacteria, fungi, and viruses residing in diverse regions of the human body. The human stomach consists of a unique and heterogeneous habitat of microbial communities owing to its anatomical and functional characteristics, that allow the optimal growth of characteristic bacteria in this environment. Gastric dysbiosis, which is defined as compositional and functional alterations of the gastric microbiota, can be induced by multiple environmental factors, such as age, diet, multiple antibiotic therapies, proton pump inhibitor abuse, H. pylori status, among others. Although H. pylori colonization has been reported across the world, chronic H. pylori infection may lead to serious consequences; therefore, the infection must be treated. Multiple antibiotic therapy improvements are not always successful because of the lack of adherence to the prescribed antibiotic treatment. However, the abuse of eradication treatments can generate gastric dysbiotic states. Dysbiosis of the gastric microenvironment induces microbial resilience, due to the loss of relevant commensal bacteria and simultaneous colonization by other pathobiont bacteria, which can generate metabolic and physiological changes or even initiate and develop other gastric disorders by non-H. pylori bacteria. This systematic review opens a discussion on the effects of multiple environmental factors on gastric microbial communities.

 RESUMOOs pombos possuem uma rica diversidade de microrganismo, entre eles fungos sapróbios, como do gênero Cryptococcus, que podem atuar como agentes patogênicos para o homem e animais. Objetivou-se o isolamento, a caracterização bioquímica e a molecular de amostras de Cryptococcus spp. de excretas ambientas de pombos. Foram colhidas 100 amostras ambientais de pontos equidistantes e representativos da área da cidade de Araçatuba, São Paulo. As amostras foram rasteladas do solo de vias públicas, armazenadas em frasco coletor e encaminhadas para o Laboratório de Bacteriologia e Micologia da FMVA, onde foram processadas e cultivadas em duplicata, em placas de Petri contendo ágar Sabouraud dextrose a 4% e Niger. Em seguida, foram incubadas à temperatura ambiente e a 30ºC, respectivamente, por um período não inferior a 15 dias. Após a observação diária, as colônias sugestivas para levedura foram reisoladas em ágar Niger e submetidas a testes bioquímicos para posterior caracterização molecular pela técnica da PCR. Como resultado, a caracterização bioquímica e a molecular isolaram 32 colônias leveduriformes, sendo 8% dos cultivos positivos para Cryptococcus neoformans var. neoformans, 17% para Rhodotorula rubidae e 7% Candida albicans. Pelo exposto, concluiu-se que excretas ambientais de pombos constituem um microfoco para Cryptococcus neoformans var. neoformans e outras leveduras com potencial patogênico, representando um risco à saúde pública, sendo necessárias medidas preventivas, como a higienização com a correta remoção das excretas, a fim de minimizar os riscos de exposição ambiental. Palavras-chave: Cryptococcus neoformans, pombos, bioquímico, PCR, saúde pública ABSTRACT Pigeons have a rich diversity of microrganisms, including fungi saprobes such as the genus Cryptococcus that can act as a pathogen for humans and animals. The aim of this was their isolation, biochemical and molecular characterization of samples of

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