WASHINGTON (AP) — American federal health officials say results from a U.S. trial of AstraZeneca’s COVID-19 vaccine may have included “outdated information” and that could mean the company provided an incomplete view of efficacy data.

A spokesman from the drug company said Tuesday it was “looking into it.”

AstraZeneca reported Monday that its COVID-19 vaccine provided strong protection among adults of all ages in a long-anticipated U.S. study, a finding that could help rebuild public confidence in the shot around the world and move it a step closer to clearance in the U.S.