There are several Covid strains that we now know of from Alpha to Beta with another one being Omicron.
As well as keeping up-to-date with the latest variants, people are also keeping an eye on symptoms with the main three such as a new and continuous cough, still at the top of the list.
But now it's feared that one of the latest strains is said to be capable of re-infecting patients within weeks of them recovering from the virus.
