Fig. 5: Frequency of self-reported symptoms in patients with ongoing PCC after vaccination.

Indicated self-reported symptoms were retrieved from the DigiHero data set and analyzed with respect to vaccination status. Only symptoms that were reported as moderate or severe were considered to be symptomatic. Groups: Ongoing PCC, not vaccinated (n = 30); ongoing PCC, one time vaccinated post-infection (n = 86); ongoing PCC, two times vaccinated post-infection (n = 52). Statistics: Chi-squared test for trend in proportions.