在巴西SARS-COV-2爆发初期,亚马逊州与南部和东南部州的污染率之间存在显着差异。亚马逊雨林附近的地区出现了更高和更快的污染。本文试图通过对巴西COVID-19流行的全球分析来解释这一现象。它还调查了气候条件和空中传播与亚马逊州传染病演变之间的关系。调查SARS-COV-2在这些不同宏观环境中传播的方法是基于对三个广泛的每日死亡人数官方数据库的分析,人口遵守限制政策的百分比,以及当地的气候条件。此外,这些国家的社会条件也得到了考虑。然后,比较了气候特征非常不同的国家的流行病学结果,几乎同时,类似的社会隔离措施。然而,所有这些分析都无法解释巴西地区之间大流行演变的显著差异.所以,有必要调用机载传输,非常高的空气湿度促进了,作为解释雨林地区传染病快速演变的决定性因素。空气湿度似乎是病毒传播中最重要的气候因素,而通常的环境温度没有强烈的影响。这项分析的另一个非常重要的结果是,观察到集体免疫的开始可能是在亚马逊人口的污染率约为15%的情况下实现的。
At the beginning of the SARS-COV-2 outbreak in Brazil, there was a striking difference between the contamination rate in the Amazonian States and the South and the Southeast States. The regions near the Amazon rainforest presented much higher and faster contaminations. This paper attempts to explain this phenomenon through a global analysis of the COVID-19 epidemic in Brazil. It also investigates the relationship between climate conditions and airborne transmission with the evolution of contagion in the Amazonian states. The method of investigation of the spread of SARS-COV-2 in these different macro-environments was based on the analysis of three extensive daily official databases on the number of deaths, the percentage of adherence of the populations to the restriction policies, and the local climatic conditions. Besides, the social conditions in those States were also taken into account. Then, it was compared the epidemiologic results for States with very different climatic characteristics and that had adopted, almost simultaneously, similar social isolation measures. However, all these analyses were not able to explain the remarkable difference in the evolution of the pandemic among Brazilian regions. So, it was necessary to invoke airborne transmission, facilitated by the very high air humidity, as a decisive factor to explain the faster evolution of contagion in the rainforest region. Air humidity seems to be the most important climatic factor in viral spreading, while usual ambient temperatures do not have a strong influence. Another very important result of this analysis was the observation that the onset of collective immunity may have been achieved with a contamination rate of about 15% of the Amazonian population.