- Oct 27, 2017
However almost none of the existing research has compared long Covid sufferers with people who have never been infected, making it possible that some of the health problems were not caused by the virus.
A new study published in The Lancet journal asked more than 76,400 adults in the Netherlands to fill out an online questionnaire on 23 common long Covid symptoms.
Between March 2020 and August 2021, each participant filled out the questionnaire 24 times.
During that period, more than 4,200 of them -- 5.5 percent -- reported catching Covid.
Of those with Covid, over 21 percent had at least one new or severely increased symptom three to five months after becoming infected.
However nearly nine percent of a control group which did not have Covid reported a similar increase.