Black et al. — Efficacy, safety and immunogenicity of heptavalent pneumococcal conjugate vaccine in children

The Pediatric Infectious Disease Journal, 2000 · 10.1097/00006454-200003000-00003

HELD UP

In plain language

Black et al. (2000), the Northern California Kaiser Permanente trial, tested the 7-valent pneumococcal conjugate vaccine (PCV7, Prevenar) in about 37,800 infants and found roughly 97 percent efficacy against vaccine-type invasive pneumococcal disease, a result that recomputes cleanly and holds up. The design point relevant to the schedule is the control arm: infants in the comparator group received an active meningococcal-C CRM197 conjugate vaccine, not an inert placebo. That is appropriate for an efficacy trial but means the study cannot establish an absolute reactogenicity or tolerability baseline for PCV7. PCV13 (Prevenar 13), which is on the current UK schedule, was subsequently licensed largely on non-inferiority to PCV7, so the whole pneumococcal-conjugate lineage chains its safety back to this active-comparator trial rather than to any inert-placebo evidence. The efficacy conclusion is sound; the absolute-safety inference is simply not something this design can provide.

Flags

None — the paper held up.

Method — the checks that were run

recompute efficacy — Vaccine-type invasive disease efficacy recomputed ~97.4%, reproduces the paper.
classify comparator — Control arm received an ACTIVE meningococcal-C CRM197 conjugate vaccine, not inert placebo -> no absolute tolerability baseline; PCV13 licensed on non-inferiority vs PCV7.

Next leads — where to look next

PCV13 vs PCV7 primary immunogenicity/safety RCT A primary Prevenar-13 randomized trial (not the Adis review PMID 24030738) still needs a forensic audit to confirm the non-inferiority chain and its comparator.
A primary Prevenar-13 randomized trial (not the Adis review PMID 24030738) still needs a forensic audit to confirm the non-inferiority chain and its comparator.

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