It's very difficult to get a one rule fits all scenarios in a case like this. My wife has essential medical treatment that effectively wipes out her immune system yet with the treatment her condition is controlled sufficiently to allow her to work. It's the same with a lot of people with diabetes, hypertension, COPD, asthma, etc. which all seem to be quite markedly, adversely linked with this virus. Modern medicine allows these conditions to be controlled far more than was the case even 20 years ago and in many cases it allows patients to lead pretty much fully functioning lives. The problem for my wife and many others is that at the moment the advice from the government is to carry on going into work unless there is a specific case that brings in the requirement for self-isolation. What this policy doesn't fully recognise is that the degree of risk employees are taking by continuing as normal is not equal. From what we know so far it is not an exaggeration to believe that a worker who's say 60+ and has relevant pre-existing medical conditions are, in all likelihood, maybe 100 times more likely to die than a fit healthy 25-year-old yet the current advice does not address this in a way that alleviates the natural concerns of those in a vulnerable state. I don't actually see how this can be satisfactorily addressed because, as others have mentioned up thread the government is going to take a view on this in terms of what steps are necessary to control the outbreak and how damaging these measures might be for the economy, the smooth working of society, etc. against how many people are going to die. It would be a relatively painless decision to ban crowds at sporting or cultural events like Glastonbury but much more difficult decision to, for example, close down the London Tube network.