LOS ANGELES — Three Democratic-controlled West Coast states announced plans Wednesday to form a “health alliance” that would review scientific data and make vaccine recommendations for their residents, saying that the federal agency responsible for issuing such guidance for the country had become “a political tool that increasingly peddles ideology instead of science.”

The move, which comes at a time of unparalleled turmoil at the agency, the Centers for Disease Control and Prevention, is an effort by California, Oregon and Washington to take scientific stewardship into their own hands after Health Secretary Robert F. Kennedy Jr., a vaccine skeptic, has taken control of the CDC’s vaccine decisions. Other states, including several in the Northeast, are considering joining in a similar effo

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