![]() Similarly, at high RH (50% ∼ 90%), the contaminated droplets would thin out less compared to the spread at low RH (10% ∼ 30%). Their numerical simulations of droplet spreading through coughing and sneezing has shown that at low temperatures (0☌) the spread of contaminated respiratory droplets would be quite wider and larger in spatial sense, compared to the spread of droplets at 20C to 40C. Studies also indicated that TGEV and human coronavirus 229E survivability at low temperature and medium and low RH is rather enhanced.Ī recent COVID-19 study on droplet dynamics showed that the spreading and concentration of contaminated droplets’ have strong and significant correlation to weather temperature and humidity. Typical healthcare environments with varying relative humidity (RH) but an ambient temperature (AT) at around 20C showed that potential surrogate virus types like transmissible gastroenteritis virus (TGEV) and mouse hepatitis virus (MHV) loose very small infectivity within a period of two days. While the virus persisted throughout the year of 2020, hospitalizing thousands of patients all across the United States, many researchers claimed that the pattern of rise-fall-rise (winter-summer-winter) of the rate of daily infections indicates that the respiratory virus has a strong correlation with the seasonality, particularly with the changes in temperature, relative humidity (RH), absolute humidity (AH) and host behavior–.īecause of the potential resemblance of typing of SARS-CoV-2, researchers have studied surrogate models to find out the survivability under different environmental settings. Human to human transmission of acute respiratory viruses, such like SARS-CoV-2, has turned into a widespread pandemic, with large fractions of infected patients suffering from acute respiratory distress syndrome (ARDS) and needing non-invasive and invasive mechanically ventilated interventions. Recent studies by different researchers show that weather temperature, humidity and precipitation may have largely contributed to the spread of influenzas and airborne viruses that are mediated through the means of aerosol droplets of different sizes. ![]() Köppen–Geiger classification showed the differences in weather pattern between the four countries, and the analysis showed that there is very weak correlation between either outside weather and/or relative humidity alone to the COVID-19 pandemic. Outside temperature did not fluctuate much in tropical countries, but Brazil and Colombia added 4.17 million and 1.1 million cases, respectively. The eighteen cold regions of France and Italy has seen an average drop in temperature from 10☌ to 6☌ and 17☌ to 7☌, respectively, and France recorded an addition of 2.3 million cases, while Italy recorded an addition of 1.8 million cases. ![]() ![]() Daily outside temperature, relative humidity and hospitalization/cases are analyzed using Spearman’s correlation. Thirty-six regions/states from two humid-tropical countries, namely Brazil and Colombia and two countries with temperate climate, France and Italy, are studied over the period of October to December. This study aims to explore and understand the common belief that COVID infection rate is highly dependent on either the outside temperature and/or the humidity.
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