https://apnews.com/0f4477f4dcc5d10f36974b66eac86d6c

WASHINGTON (AP) — Drugmaker Pfizer is expected to request authorization this week for an additional COVID-19 booster dose for seniors, according to a person familiar with the matter.

It would add a fourth dose to the regimen — currently a primary series of two shots, followed months later by a booster dose — in an effort to provide maximum protection to the over-65 population that has been hit hardest by the pandemic.