I don't know about the cheerful part but your immune system has faced an extraordinary number of infections, perhaps from your penchant for travel. If you do get infected the good news is that there is a surplus of monoclonal antibody treatments for people in a risk group.

There are over 4,000 varients but a strain is a predominate highly successful varient that exceeds the others in infection, spread and severity.

I am still too young for the current vaccine jab over here.