The advisory group to the WHO is weighing up a new US study that suggests droplets from coughs and sneezes could be projected further than originally thought.
Respiratory droplets — which are considered to be the main way sickness spreads — are generally thought to travel short distances before falling onto surfaces near to the person who released them.
It's why the WHO recommends people maintain a distance of at least 1 metre from anyone coughing or sneezing. The Australian Government advises individuals to stay 1.5 metres away from others.
But researchers at Massachusetts Institute of Technology found that, in laboratory conditions, coughs can project liquid up to six metres away and sneezes can reach up to eight metres away.
Professor Heymann told BBC News that if the evidence is supported, then "it might be that wearing a mask is equally as effective or more effective than distancing".
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