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• W4283208786 abstract "Adults with chronic kidney disease (CKD) are at high risk of pneumococcal infections and recommended to receive pneumococcal immunization. Some studies suggest that previous immunization with 23-valent pneumococcal polysaccharide vaccine (PPV23) may decrease the immunogenicity of 13-valent pneumococcal conjugate vaccine (PCV13). Via quantitation of serum IgG, IgM, and IgA specific to 7 pneumococcal serotypes (3, 6B, 9V, 14, 19A, 19F, 23F), we recently found that the response to PCV13 in previously PPV23 immunized patients with severe CKD was inferior compared to PPV23 naïve patients. As a follow-up of the previous study, we assessed the titers of opsonizing antibodies specific to 13 vaccine serotypes in sera collected as per the original clinical trial protocol. Opsonophagocytic activity (OPA) titers were determined in 57 previously PPV23-immunized (Group 1) and 72 PPV23-naïve (Group 2) patients pre- and post-PCV13 immunization (days 28 and 365). Pre-immunization, the geometrical mean titers (GMT) for 3/13 serotype-specific antibodies were significantly higher in Group 1 than in Group 2. PCV13 induced a significant GMT rise in both groups; an increase in 5/13 serotype-specific GMTs in Group 1 and 12/13 GMTs in Group 2 was present at one year post-immunization. Fold increase in GMTs by day 28 ranged between 2.4 (serotype 1) and 24.6 (serotype 6A) in Group 1, and between 4.3 (serotype 3) and 67.0 (serotype 6A) in Group 2. The fold increase was significantly larger in Group 2 than in Group 1 for serotypes 1, 4, 7F, and 18C. Patients of Indigenous ethnic background had significantly higher GMT for serotypes 6B and 23F at baseline, and for serotypes 5, 6B, 14, 18C, 19A, 19F, and 23F at Day 28 post-immunization, compared to the non-Indigenous counterpart. Conclusions: Patients with severe CKD developed functionally active pneumococcal antibodies post-PCV13 immunization. Previously administered PPV23 had a negative impact on several serotype-specific OPA responses to PCV13 that lasted for at least one year post-immunization. ClinicalTrials.gov ID: NCT02370069." @default.
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• W4283208786 date "2022-07-01" @default.
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• W4283208786 title "Opsonophagocytic activity against Streptococcus pneumoniae in Indigenous and non-Indigenous patients with severe chronic kidney disease immunized with 13-valent pneumococcal conjugate vaccine" @default.
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• W4283208786 doi "https://doi.org/10.1016/j.vaccine.2022.06.042" @default.
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