The flu virus has the capacity to generate new strains every year that test the effectiveness of vaccines, because it is a master of "disguise": it has machinery specialized in combining modules of its RNA, its genetic material, as if They were Lego pieces that can be exchanged to generate different functions.
On the other hand, SARS-CoV-2 appears to be a stable virus, which accumulates on average two mutations per month, and whose strategy to adapt is to have a large and versatile genome, also made of RNA. However, in recent weeks new variants have been detected in the United Kingdom with a high number of mutations, which exceed what was expected and which... See more