FILE PHOTO: Vials labelled "COVID-19 Coronavirus Vaccine" and sryinge are seen in front of displayed Johnson&Johnson logo in this illustration taken, February 9, 2021. REUTERS/Dado Ruvic/Illustration/File Photo

LONDON (AP) — Johnson & Johnson released data showing that a booster dose to its one-shot coronavirus vaccine provides a strong immune response months after people receive a first dose.

The study’s results haven’t yet been peer-reviewed.

J&J said in a statement Tuesday that it ran two early studies in people previously given its vaccine and found that a second dose produced an increased antibody response in adults from age 18 to 55.