On Island, they tested alot, and analysed on the virus (they have a big Genome firm there).
Aparrenly they found over 40 differnt mutations of the virus! and in 1 case, they found a person who carried two strains of the virus (a early strain and a mutated one).
Whats worse than haveing coronavirus?
Haveing 2 differnt verisons of it at once.
Source: https://www.information.dk/indland/2020/03/forskere-sporet-40-mutationer-coronavirus-alene-paa-island?lst_frnt