"They swapped genes and mutations."
Viruses are asexual reproducers, meaning the offspring are exact copies of the "one" parent. There is no combing of genes between two parents to create an offspring even "better" than either parent.
Mutations occur randomly. Somehow an A gets swapped with a C, T, or G in a strand of DNA, which causes a slightly different protein to form. Most mutations are benign. Some are harmful to the organism. A few are beneficial. It is possible for a re-arrangement of A's, C's, G's, and T's to provide longer asymptomatic incubation time. That would be beneficial to this virus.
It is well known that the annual flu vaccine is really good for last year's flus. Unfortunately, enough beneficial mutations have occurred that the vaccine is less than 100% effective.
Yes, there will be a Covid 21. And there will be a 22 and 23. We should plan that this virus is going to be one step ahead of the vaccines. Covid will be around for a long time regardless of whatever interventions our political leaders do. Especially when too many of the general public tend to ignore good advice for reducing the spread.
To say that two strains coming together to create a better strain is scientifally bunk. The new Covid will not come from two Covid-19 viruses meeting and engineering a new version of themselves.
Does the world have a plan for new versions of Covid? Especially for strains that can bypass the vaccines. Probably not. But our current systems of governance means we will bumble from strain to vaccine to strain to vaccine.
Time for a new way of governing, I say.
But Umair likes to blame politicians.