The U.S. Food and Drug Administration on Tuesday approved Pfizer's RSV vaccine for the prevention of lower respiratory tract disease caused by RSV in adults aged 18 to 59 at increased risk of the disease.

A new FDA approval has given Pfizer a broader label for its respiratory syncytial virus (RSV) vaccine Abrysvo than rival shots from GSK and Moderna, but it may not make much of a difference in the battle for market share.

Pfizer’s Abrysvo is the first respiratory syncytial virus vaccine that can be used for adults less than 50 years of age. Tuesday’s label expansion covers younger adults who are deemed at higher risk of RSV-related lower respiratory tract disease.

Abrysvo can prevent lower respiratory tract disease caused by RSV for people between the ages of 18 and 59 who are at increased risk. It is the first RSV vaccine indicated for adults younger than 50,

The U.S. FDA has approved Pfizer's respiratory syncytial virus vaccine Abrysvo for individuals 18 to 59 years old that are at increased risk of lower respiratory tract disease from the virus. Those conditions include obesity,