According to a recent MIT report released in March, areas with average temperatures between 3-degree Celcius and 13-degree Celsius (37-degree Fahrenheit and 55-degree Fahrenheit) had the most confirmed coronavirus cases. While the countries with average temperatures above about 18-degree Celcius (64-degree Fahrenheit) made up less than 5% of total reported cases.
Similarly, European researchers said they found 95% of cases worldwide were recorded in colder areas. China's hot and humid cities experienced slower transmission rates than colder ones.
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Other researchers found that the virus spread more forcefully in areas between 5 degrees Celsius and 11-degree Celcius (41-degree Fahrenheit and 52-degree Fahrenheit) along with an average humidity rate between 50% and 80%.
But none of these papers have been peer-reviewed and factors like access to quality medical care, government action, testing rates, the density of an area's population and other principle factors in coronavirus transmission were not taken into consideration.
Many studies have shown humidity greatly affects the transmission and of the flu. But viruses like SARS were only contained because of government interventions and not because of warm weather or higher humidity levels. Coronavirus spreads similarly to the influenza virus as small mucus droplets spread in the air.
Researchers suggest that viruses lose infectivity because the particles lose structural integrity. Therefore, knowing how the droplets evolve in different temperature and humidity conditions can tell us more about how infectious it can get.
Seasonal circumstances could contribute to a slower spread of viruses in warmer times of the year. These include schools breaks having more personal space. Spending more time outdoors, and higher levels of Vitamin D from getting more sunshine.
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