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?:abstract
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COVID-19 has been disturbing human society with an intensity never seen since the Influenza epidemic (Spanish flu) COVID-19 and Influenza are both respiratory viruses and, in this study, we explore the relations of COVID-19 and Influenza with atmospheric variables and socio-economic conditions for tropical and subtropical climates in Brazil Atmospheric variables, mobility, socio-economic conditions and population information were analyzed using a generalized additive model for daily COVID-19 cases from March 1(st) to May 15(th), 2020, and for daily Influenza hospitalizations (2017-2019) in Brazilian states representing tropical and subtropical climates Our results indicate that temperature combined with humidity are risk factors for COVID-19 and Influenza in both climate regimes, and the minimum temperature was also a risk factor for subtropical climate Social distancing is a risk factor for COVID-19 in all regions For Influenza and COVID-19, the highest relative risks (RR) generally occurred in 3 days (lag=3) Altogether among the studied regions, the most important risk factor is the Human Developed Index (HDI), with a mean RR of 1 2492 (95% CI: 1 0926-1 6706) for COVID-19, followed by the elderly fraction for both diseases The risk factor associated with socio-economic inequalities for Influenza is probably smoothed by Influenza vaccination, which is offered free of charge to the entire Brazilian population Finally, the findings of this study call attention to the influence of socio-economic inequalities on human health
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