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Reports of long-lasting coronavirus disease 2019 (COVID-19) symptoms, the so-called ‘long COVID’, are rising but little is known about prevalence, risk factors or whether it is possible to predict a protracted course early in the disease. We analyzed data from 4,182 incident cases of COVID-19 in which individuals self-reported their symptoms prospectively in the COVID Symptom Study app 1. A total of 558 (13.3%) participants reported symptoms lasting≥ 28 days, 189 (4.5%) for≥ 8 weeks and 95 (2.3%) for≥ 12 weeks. Long COVID was characterized by symptoms of fatigue, headache, dyspnea and anosmia and was more likely with increasing age and body mass index and female sex. Experiencing more than five symptoms during the first week of illness was associated with long COVID (odds ratio= 3.53 (2.76–4.50)). A simple model to distinguish between short COVID and long COVID at 7 days (total sample size …