Approval of Pfizer's Abrysvo in certain adults aged 18 to 59 years old will substantially expand the number of people eligible for vaccination with the shot.

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.

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 respiratory syncytial virus (RSV) vaccine (Abrysvo) was linked with fewer hospitalizations and emergency department (ED) visits in older patients during the first season of the vaccine's rollout, according to a retrospective analysis.

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,