Final answer:
A client with chickenpox or shingles can be taken off contact and airborne isolation once all the lesions have scabbed over or crusted over, respectively.
Step-by-step explanation:
When a client with chickenpox or shingles can be taken off contact and airborne isolation depends on the stage of the infection and the progress of symptoms. For chickenpox, a client can be taken off contact and airborne isolation once all the lesions have scabbed over. This usually occurs after about 7 to 10 days from the onset of rash. For shingles, a client can be taken off isolation once all the lesions have crusted over, usually within 7 to 10 days.