Unless we fall into the most vulnerable category PWD are at no more risk than the next bloke who isn't D.
If we get ANY infection - not just influenza! - or injury, then that can and very often does cause our BG to soar into the stratosphere PDQ making it harder to control. However, they can immunise us against some strains of influenza but not against the other things, so they do what they can, prevention being better than cure. No diabetic concerns themselves generally in case they should break a bone or have eg appendicitis, either of which play complete havoc with BG, do they?
I know we are all far more terrified of 'this lot' than we've ever been before we don't know the enemy, do we? so we're all concerned - but so is/are the managers having to ask ANY & ALL of their staff to work. Ditto the Boards of companies who make decisions that affect 100s or 1,000s of employees.