Coronavirus carrier and at risk people

Good morning friends,

Is there a word or phrase available in Greek for someone who is infected with the virus but not showing symptoms - and therefore a potential carrier?

And is there a word for people that are "at risk" like the elderly?

Thank you.

Cosmas

Asymptomatic carrier = ασυμπτωματικός φορέας
At risk = ευπαθής

Thank you!