https://apnews.com/e871c33dd713b5a6ce9f485732daab09 > WASHINGTON (AP) — Influential government advisers will debate Friday if there's enough proof that a booster dose of Pfizer's COVID-19 vaccine is safe and effective — the first step toward deciding which Americans need one and when. > The Food and Drug Administration on Wednesday posted much of the evidence its advisory panel will consider. The agency struck a decidedly neutral tone on the rationale for boosters — an unusual and careful approach that's all the more striking after President Joe Biden and his top health advisers trumpeted a booster campaign they hoped to begin next week.