Economic Evaluation of PCV21 Use in Populations with Increasing Serotype 4 Invasive Pneumococcal Disease in the US: An Attributable Fraction Threshold Analysis. - Yi, Zinan; Owusu-Edusei, Kwame; Flem, Elmira; Feemster, Kristen; Elbasha, Elamin H. (Infectious Diseases & Therapy, 2026)