Diolch, Dirprwy Lywydd. Now, Welsh Government has so far refused to recommend that people should wear face masks when out in public. The latest advice I could find from Welsh Government is that people could wear them if they want to, which isn't particularly useful, because people look to Government for leadership at times like this.

I must say, the evidence that I am seeing is getting much, much stronger on this. A major report in The Lancet this week found that the wearing of face masks could be a very useful contribution towards keeping infection rates low. The World Health Organization is absolutely saying that the use of masks isn't enough on its own, but saying wearing a mask can limit the spread of certain respiratory viral diseases, including coronavirus. The Centre for Disease Control and Prevention in the United States recommends them. There was an interesting study from California and Taiwan at the end of May saying that the virus can remain infectious indoors for hours, and that

'measures designed to reduce aerosol transmission must be implemented,'— and I'm quoting here—

'including universal masking'.

Some 50 countries, I think, now insist that people have to wear masks, at least in some situations—just on public transport in some countries, far more widespread in others. Now, they don't have the physical side effects, potentially, of a new drug say, or the mental health implications of lockdown, so surely, the burden of proof should be lower on this. And if it makes a contribution, then why not? Even if only part of a marginal-gains approach. So, will Government listen to that growing evidence and introduce clear guidelines actively encouraging the use of face covering?