The Welsh NHS is currently under immense strain with staff shortages, flu and Covid all adding to the pressure. And coronavirus is raising its head significantly again now that China has ended its zero-Covid policy and the virus has swept through large parts of the population.
The more people have the virus, the greater the chance of a new mutation emerging. New mutations have come up multiple times since the virus first emerged with the omicron strain, for example, being far more transmissible than others.
A new Covid-19 variant, that epidemiology professor Tim Spector described as the one "to watch out for" this year, is reported to account for more than 40% of cases in the US. Cases there have more than doubled in a week. You can get more health news and other story updates straight to your inbox by subscribing to our newsletters here.
