I believe (but I can't find the reference now) that there's a case (or cases?) where testing and contact tracing have found a cluster where the source was someone asymptomatic. Which isn't, I realise, particularly reassuring. And as certain countries are not doing extensive testing & tracing.....
Higher risk of course, like other viral infections, is of transmission before someone shows symptoms (e.g. common cold https://www.nhs.uk/conditions/common-cold/). Speaking purely selfishly this is the aspect that most concerns me and is why I've been 'social distancing' and being more careful with hygiene for some time before orders from on high went out (I'm a 1957 'flu survivor but it's the lifelong effects of that on my immune & respiratory systems that make me in a higher vulnerability/risk category).

I hope you, Oswin, and the rest of the family, stay safe.