Shared atoms among humans

[TheVat]

And retroviruses, which do inject RNA into a host cell and alter that cell's genome, don't transmit easily unless there is more intimate contact, so your cellular makeup is probably safe.  The bigger concern, obviously, are virus particles carried in airborne droplets (aerosols) from someone who has covid.  Even if vaxxed, you can get an unpleasant illness.  And then give it to someone who is vulnerable.   

If you are interested in particles that transfer by means of surfaces in the office, you might google fomites to learn more.