So it’s reasonable to think that the same may be true for the COVID-19 coronavirus, SARS-CoV-2, which has a similar size and structure.įlu viruses are transmitted more easily in cold, dry air. Flu viruses survive and are transmitted more easily in cold, dry air. However, studies have shown that the annual increase in colds and flu particularly coincides with when the temperature outside and relative humidity indoors are lower. Another theory is that people produce less vitamin D when there is less sunlight and so have weaker immune systems. You are more likely to choose the option of travelling on a crowded bus or train than walking or cycling to work when the weather is cold and wet. It’s often attributed to the fact that people spend more time indoors when it’s colder, coughing, sneezing and breathing on each other. ![]() ![]() We know that more people get colds and flu in the winter (the colds can be caused by types of coronavirus), but there are several potential reasons for this. The re-opening of schools and universities led to greater mixing of individuals from different households, but could the fall in outside temperatures also be playing a part? Why is the reported number of COVID-19 cases rising across Europe now? Many countries ended their full lockdowns at the start of the summer, but it wasn’t until the autumn that most places began to see a significant increase in the spread of the virus again.
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