Around the world there are reports of people still suffering from Covid-19 symptoms, several weeks after they contracted the virus.
Fatigue, difficulty breathing and reduced cognitive ability are among the symptoms some are experiencing and doctors are struggling to explain why.
Dublin Ladies footballer Siobhán Killeen, 27, contracted Covid-19 in March. Between training sessions and her job as a radiographer at the Mater Hospital, she had very little down time before she became sick. "I would've been very active.
Working eight to five in the hospital and then overtime on top of that. And then training every day. I was constantly on the go", she said When she got the virus she felt quite unwell with flu-like symptoms for the first week.