Just a reminder that medical consent is your right. You have the right to say no to any medical procedure for any reason.
Inasmuch as you have a right to authorize or deny medical procedures on your own body, you are responsible for how your own body affects those around you. When you allow your body to become a vector for transmission you bear responsibility for spreading the disease.
https://www.businessinsider.com/delta-variant-made-herd-immu...
Also (to contradict your statement) if police believes your are DUI they can force to take your blood, is this different in the US?