Three mutant strains of coronavirus have been causing concern among leading virologists. Known as XD, XE and XF, each so-called "recombinant" is being closely monitored for its severity and spread across Europe.
In the UK, coronavirus infection rates have been increasing for more than a week, and one of the main reasons behind this spike is thought to be the emergence of more sub-variants. In Wales the number of daily cases being reported is on the rise and has now reached close to 300 cases per 100,000 population, but it remains to be seen what is causing the increase here.
Imperial College of London virologist Tom Peacock has produced a useful twitter thread on these new lineages and how concerned the public should be about each one. Here, we look at his analysis in more detail.
