Question · Q4 2025
Thomas Schrader asked if the OPUS-3 study format is similar to Merck's equivalent (STRIDE-6) and if the trial is complicated by the wide window of prior PCV vaccination.
Answer
Grant Pickering, CEO of Vaxcyte, confirmed that Pfizer and Merck ran similarly designed studies, though not precisely the same, noting Pfizer presented baseline immune responses while Merck did not. Jim Wassil, EVP and COO, acknowledged the heterogeneity but stated the goal is to show VAX-31 expands coverage without inducing hyporesponsiveness, which has not been observed with PCVs.
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