Clinical Trial Assessing the Immunogenicity of an Anti-pneumococcal Vaccination Strategy (PCV13+PPV23 Versus PREVENAR20) in Adult Patients Treated for a Lymphoma

Cohort study A before modification of vaccination national guidelines

"Health authorities changed guidelines to recommend one injection of PREVENAR20 instead of the 2-vaccine scheme general practitioners are usually in charge of this vaccination.~Cohort study B"