UW epidemiologist Ajay Sethi calls the potential eligibility of 12- to 15-year-olds “a very important step to increase immunity to the virus in our community.” But he said it may take time to get some parents on board. Some, he said, will probably wait and see if the virus is under control in terms of infection rates before making a decision, and some may decide to vaccinate their children after more is known about the disease.