From Thailand forum that I follow.
A mate in SGP
"I have just recovered from this thing.Double jabbed and boostered. Even so it was worse than any bad flu I have had. Started Saturday .
Thought I had a bad hangover. Had some left over curry for a "feed the hangover" cure and couldnt taste it at all. So tested at home and positive.
By Sunday night fever was at 39.2 and I felt like death. At one point during the night my body was hurting so much I seriously thought about going to hospital. Fever broke some hours later, and the recovery began. Tested this morning , very faint red line now.Feeling better .
Should be ok tomorrow. For all the things said.Im so glad I was fully jabbed.
Some people show no symptoms, some mild, some pretty bad."
Personally I think that by now a majority of people had it. Some asymptomatic, some very light, some rather bad (like Markit or this guy), some very very bad with hospitalization.