Will warmer spring weather slow down the rate of spread?

摘要

IN THE northern hemisphere, as winter ends, cases of seasonal flu dwindle. Could the same happen with covid-19? Flu surges in winter for three reasons. First, the virus is more stable in cold, dry conditions with low levels of ultraviolet light. Second, people spend more time together indoors, which facilitates viral spread. Third, our immune systems may be weakened due to the mild vitamin D deficiency a lack of sunlight can cause.