What Covid-19’s long tail is revealing about chronic disease
David Cox writes: One of the major challenges for doctors attempting to treat long Covid is that there are likely to be a variety of underlying triggers or causes, depending on the patient. Recent epidemics have provided one way of gaining crucial clues about what these underlying causes might be. Far from being unique to Sars-CoV-2 – the virus that causes Covid-19 – some scientists believe almost all infectious outbreaks leave behind a proportion of patients who remain chronically unwell…