Mrs. Wilson is visibly pregnant. Michael is currently due for polio, MMR, and varicella immunizations. These vaccine viruses are not transmitted from immunized children to others. Varicella - Varicella vaccine virus is almost never transmitted from immunocompetent vaccine recipients to others. The risk of wild varicella virus from a child far exceeds the risk of transmission of vaccine virus.
Few children get a rash after receiving the vaccine.
It is highly unlikely that the vaccine virus would be transmitted to a pregnant household member. There is no information suggesting harm to the fetus from the varicella vaccine virus. Children of a pregnant woman or with another pregnant household member should receive the varicella vaccine on schedule. Reports of spontaneous abortion or birth defects following varicella vaccine given to a pregnant woman fall within what would be expected as background rates of these events.