Active herpes zoster lesions are infectious, through direct contact with vesicular fluid, until they dry and crust over. People with active herpes zoster lesions should cover their lesions and avoid contact with susceptible people in their household and in occupational settings until their lesions are dry and crusted.

How long are shingles blisters contagious?

If you have shingles, you are contagious until the last blister has scabbed over. This will usually occur after about 10 to 14 days.

How long is zoster contagious?

"When you have shingles, you're considered contagious until your open sores crust and scab over. This generally takes between 7 to 10 days," says Dr. Brown. "Depending on where your rash develops on your body and where you work, you may (or may not) be able to return to work before your shingles dry up."