Six in 10 people with SARS-CoV-2 still have at least one symptom of long Covid a year later, with fatigue, shortness of breath and irritability being the most common, a new study has shown.

The study, being presented at this year's European Congress of Clinical Microbiology and Infectious Diseases (ECCMID) in Portugal, found that Covid-19 symptoms that don't clear up after 15 weeks are likely to last at least a year.