WASHINGTON (AP) — The U.S. has taken the unprecedented step of dropping the number of vaccines it recommends for every child — a move that leading medical groups say would undermine protections against a half-dozen diseases. The overhaul to the federal vaccine schedule, announced Monday, is effective immediately and stops broadly recommending protection against flu, rotavirus, hepatitis A, hepatitis B, some forms of meningitis and RSV. Protections against those diseases are now only recommended for certain groups deemed high-risk, or if their doctors recommend them. Officials say the overhaul won’t result in any families losing access or insurance coverage for vaccines, but medical experts say it creates confusion for parents and could increase preventable diseases.