To prevent the spread of chickenpox infection:

• You or your child should not return to work, school, or day care until after all blisters have crusted over, usually about 10 days after the first symptoms start.
• Clean countertops regularly with a surface cleaner. And wash clothing that is soiled with fluid from chickenpox blisters.
• Stay away from other family members who have not had chickenpox. Family members are more likely to get chickenpox from an infected person in their household than from playmates, schoolmates, or coworkers.
• Stay away from people who have not had chickenpox or the chickenpox vaccine. This is especially important if you are pregnant or have an impaired immune system.