The Government’s “Freedom Day” put an end to compulsory mask-wearing at most locations.
But they remain more vital than ever and capable of preventing up to 53 percent of infections.
Dr McClymont said people should especially wear masks at Christmas events with groups.
She added: “If an infected person coughs or sneezes without wearing a mask, they’re more likely to spread these droplets further and infect other people.”
Autumn and winter often nudge countrywide case rates north as people spend more time inside, where the virus circulates best.
If possible (and not too cold), people should prioritise meeting outdoors.
Dr McClymont explained: “Meeting outdoors vastly reduces the risk of airborne COVID-19 transmission, though the weather is often crisp over Christmas, wrapping up warm and meeting friends for a walk in the woods or park can be a nice alternative to meeting indoors.
“If meeting outdoors is not an option, or you are planning to have friends and family over for Christmas dinner, try to let as much fresh air in as possible.
“The more fresh air you let into your home or other enclosed spaces, the less likely a person is to inhale infectious particles.”