Doctors claim they are seeing more and more cases of MRSA in children. According to the Centers for Disease Control and Prevention, an estimated 95,000 people in the United States developed serious MRSA infections in 2005, the latest data available. While the CDC cannot say how many children were infected, the agency reported the greatest increase in hospital visits were among those under 18 during an eight-year period ending in 2005. Children are especially vulnerable because of their underdeveloped immune systems, experts say.