The WHO will NOT issue a Public Health Emergency of International Concern (PHEIC) or equivalent formal international health alert (e.g., WHO Grade 3 Emergency with international spread finding) for the South African cruise-ship human-to-human hantavirus strain before June 17, 2026.

Base rate for PHEIC declaration within 6 weeks of initial cluster identification for a novel but geographically contained pathogen is approximately 15% (derived from: Ebola 2014 — no; Marburg 2023 — no; Mpox first pass 2022 — no; H1N1 2009 — yes within ~2 weeks, but that was already multi-country spread). Bayesian update from framework analysis: unanimous four-framework directional agreement, with specific mechanistic accounts of WHY delay occurs (capital-interest filter, knowledge aggregation failure, liquidity preference, credibility-reserve logic) each operating independently yet pointing to the same outcome. The mechanisms are structurally complementary — they would have to fail simultaneously for PHEIC to issue within the window. The most active counter-pressure (post-COVID institutional reform, DG reputational stakes) is partially offset by the most active suppressing force (South Africa’s resistance plus cruise-industry lobbying). Adjusted estimate: ~18% probability of PHEIC within 6 weeks; expressed as confidence in the NO-PHEIC claim: 0.82. Confidence-in-confidence is ‘medium’ because the novelty of H2H hantavirus transmission introduces genuine epistemic uncertainty — this pathogen type has never traveled this route before, and the institutional system itself has never faced this exact prior.