How effective are face masks at stopping the spread of flu?

Masks were a common sight during the Covid pandemic, and they’re making a comeback (Archive picture: Getty)People on public transport are wearing face coverings again, while hospitals are asking staff and patients to mask up.
Not just a blast of nostalgia for 2020, it’s due to a strain of flu rampaging through the country causing so much pressure on the health service a hospital had to declare a critical incident yesterday.
So if you don’t want to catch it and be laid low for