Thousands of people across the globe are experiencing a worrying cycle of Covid-19 symptoms months after recovering from the disease. Four of the so-called 'Covid long-haulers’ - from South Africa, Canada, Bangladesh and New Zealand - share their persistent symptoms, from dizziness to brain fog, with Nuala McGovern. Education is also a long-term concern and US parents discuss the different paths they’ve chosen for returning their children to school during a pandemic. For one teacher in Arizona, however, it resulted in a difficult decision to resign rather than return to the classroom.