There were 53 cases of the disease in children younger than two in the Denver area in six months last year, Hoffman said. He could not provide statewide figures. Potential side effects of the vaccine include swelling and low-grade viral infections. For those families who move here with young children, they will be required to catch up and get the shots. The vaccine goes under the brand name Prevnar.
Critics say the vaccine costs too much and they are worried about potential side effects.
Supporters say the Colorado State Board of Health's decision to add the pneumococcal vaccine could save children's lives. Colorado is believed to be the first state to require the immunization for preschool children younger than two, but the U.S. Public Health Service made a similar recommendation in October. Only children under two would have to get the pneumococcal vaccine because older children have stronger immune systems. The vaccine is typically doled out in four doses, depending on when the child gets the first shot. Health plans usually cover the cost, but state officials worry there won't be enough federal money to cover those on Medicaid or the uninsured.