When they say “asymptomatic”, what does that mean?
Does it mean strictly people who ARE infected but show zero symptoms, ever? Does it mean they are immune and mere carriers? Does it mean the period of incubation before people show symptoms?
Asymptomatic means they had natural immunity that allowed them to recover from the virus with no symptoms.
I do believe the virus has mutated. It may be less infectious now and milder in symptoms. But I think the biggest factor, the virus season is over.
Healthy doses of bright sunlight kills it.
Look at weather maps, those areas where there is often clear skies, hot weather and less dense population had very few cases.