What is the difference between the streps A and B?

Press/Media

Period	16 Dec 2022

Media coverage

Title	What is the difference between the streps A and B?
Media name/outlet	ExBulletin
Country/Territory	United States
Date	16/12/22
URL	https://exbulletin.com/world/health/1963886/
Persons	Matthew Weissman