A group of researchers from King’s College London have found the odds of developing long COVID after infection are 20 to 50 percent lower during the Omicron wave in the UK compared to the Delta.
The peer reviewed study, published in the medical journal Lancet, used data from the ZOE COVID Symptom study app.
It involved 56,003 UK adults who were infected between Dec 20, 2021, and March 9, 2022. These cases are hereafter referred to as omicron cases as more than 70% of UK cases were estimated to be attributable to the omicron variant during that time, as per the study.
The study also looked into 41,361 patients who first tested positive between June 1, 2021, and Nov 27, 2021, when over 70 percent of the cases were that of Delta.
The research included both symptomatic and asymptomatic infections for the Delta period, while for the Omicron period, only participants testing positive before Feb 10, 2022 were considered. This was to make sure that all the participants had at least 28 days for symptom reporting after testing positive.