So many carriers are asymptomatic anyway, so no matter how well you might check clients and take precautions, you just don't know who has the virus and who does not.
Whilst I realise everyone has a choice in this and some are forced to work due to dwindling resources, the spread of the virus is only going to be curtailed if people stop mixing with others. And be aware that even with the vaccine, the virus can still spread - while the person who is vaccinated can not become ill should they be exposed to the virus, they can still be a carrier and spread the virus. We're going to be living with the coronavirus for quite some time yet.