Induction of Salivary IgA and IgG Responses by Parenteral PPV23 Vaccination in Older Adults. - Visser, Maxime; Tcherniaeva, Irina; Rond, Lia de; Zeeuw-Brouwer, Mary-lène de; Verschuren, Monique W M; Picavet, Susan H S J; Jonge, Marien I de; Hartog, Gerco den; Buisman, Anne-Marie (Open Forum Infectious Diseases, 2026)