It's only been available for a couple of years. Next comes a rash that may look like small insect bites, usually starting on the scalp and trunk, then moving to the face and legs, and eventually covering most of the body. In a few days, the raised spots turn into blisters and the rash turns itchy. The blisters will crust over and heal on their own, but most children will scratch. The disease is very uncomfortable, and many infants and toddlers can't help scratching themselves.
Scratching leads to infection, and the blisters can leave scars.
If you and your partner both work and your child is in a group daycare situation or school, this means that one of you will need to stay home to care for him. There may be soreness at the injection site. Active immunization is indicated in all children from the age of 12 months onwards. Susceptible healthy contacts should get immunized to prevent virus transmission. The vaccine is given subcutaneously.