Text this: Decreased memory B cell frequencies in COVID-19 delta variant vaccine breakthrough infection

 _    _    __   __   _____       ___      _____   
| || | ||  \ \\/ // |  __ \\    / _ \\   /  ___|| 
| || | ||   \ ` //  | |  \ ||  / //\ \\ | // __   
| \\_/ ||    | ||   | |__/ || |  ___  ||| \\_\ || 
 \____//     |_||   |_____//  |_||  |_|| \____//  
  `---`      `-`'    -----`   `-`   `-`   `---`