Humidity is lower in the winter, which is good for transmission. Why are some viruses seasonal?ĭr Marc Lipsitch: What makes seasonal viruses seasonal is a combination of opportunities for transmission – whether school is in term, which facilitates transmission – and what proportion of the population is immune, combined with weather. Experts explain why transmission of some illnesses lowers with warmer temperatures – and warn against lowering our guard.
The seasonal flu tends to dissipate during the summer, leading some to hope the coronavirus will do the same.
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