Abstract：
The COVID-19 pandemic originated in 2019 and has become an endemic disease that we must learn to live with, similar to other strains of influenza. The Organization (WHO) declared on May 5, 2023, in Geneva, Switzerland, the end of the Public Health Emergency of International Concern regarding COVID-19. As vaccines become more widely available and the pandemic appears to be improved, our focus shifts to the challenges we still face. Understanding how external factors like temperature, air humidity, and social isolation impact the spread of the SARS-CoV-2 virus remains a crucial challenge beyond our control. In this study, potential links between the number of COVID-19 cases in São Paulo City (SPC) and New York City (NWC) were explored. Our analysis was carried out utilizing the continuous wavelet transform, alongside other tools such as cross-wavelet transform and wavelet coherence. Based on our findings, there appears to be a correlation between the variables related to low frequencies, which aligns with previous research on the topic. Particularly, our research has revealed a connection between COVID-19 cases and factors such as temperature, air humidity, and social isolation rates. Regarding the latter, our findings indicate that implementing social distancing measures was a wise public policy decision, although the correlation with daily COVID-19 cases requires careful analysis. For this study, we analyzed data from February of 2020, when the first cases were reported in the cities under investigation, SPC and NWC, up until December 31, 2022, by which time the vaccination campaign was well under way.
摘要：
COVID-19大流行起源于2019年，已经成为我们必须学会与之共存的地方病，与其他流感病毒株相似。该组织（WHO）于2023年5月5日在日内瓦宣布，瑞士,国际关注的关于COVID-19的突发公共卫生事件结束。随着疫苗越来越广泛，大流行似乎得到了改善，我们的重点转移到我们仍然面临的挑战上。了解温度等外部因素，空气湿度,和社会隔离影响SARS-CoV-2病毒的传播仍然是我们无法控制的关键挑战。在这项研究中,探讨了圣保罗市（SPC）和纽约市（NWC）的COVID-19病例数量之间的潜在联系。我们的分析是利用连续小波变换进行的，与其他工具，如交叉小波变换和小波相干性。根据我们的发现,与低频相关的变量之间似乎存在相关性，这与之前对该主题的研究是一致的。特别是,我们的研究揭示了COVID-19病例与温度等因素之间的联系，空气湿度,社会隔离率。关于后者,我们的研究结果表明，实施社会距离措施是一个明智的公共政策决定，尽管与每日COVID-19病例的相关性需要仔细分析。对于这项研究，我们分析了2020年2月的数据，当时在调查的城市报告了首例病例，SPC和NWC，直到2022年12月31日，到那时疫苗接种运动正在顺利进行。
