Why there's a "flu season?"
Ever wonder why everyone seems to get the flu at the same time creating the dreaded “Flu Season”? According to a study published in PLoS One, the answer lies in humidity levels. Researchers found that flu viruses really love the winter when humidity levels hover below 50 percent. In this environment, the respiratory droplets in the body – a nice way of saying mucus – that carries the flu virus evaporate completely and the virus is better able to survive and infect the host body.
During moderate humidity months, however, the droplets do not evaporate completely so the virus is left exposed to high levels of chemicals and is less able to infect cells. This is why the flu season peaks in North America and Europe during the winter months when the humidity is low.