Health Secretary Robert F. Kennedy Jr.'s intervention in COVID-19 vaccine recommendations without input from a key U.S. CDC advisory panel has sown confusion among physicians and insurers over who should get the shots and whether they will be covered,

Federal health officials have changed the game for COVID vaccine access. Pregnant moms and others who rely on them to protect a high-risk family member are scared.

The rewriting of government recommendations will make the effort to get vaccine doses into arms exponentially more difficult, experts say.