O-26 - The natural reservoir and the index case exposure route were not identified by the 1976 Ebola investigation
Note: the source-node summary’s ‘asymptomatic seropositive villagers with no hospital/known-case contact’ detail is NOT established by this 1976 report (no such community serosurvey is reported in it); only the hospital-amplification and unresolved-source findings are extracted.
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Why this is evidence
That the antecedent zoonotic source went unidentified while the amplifying venue dominated the case record is the pattern H-19/H-15 posit for the market — the true origin elsewhere or unknown — against H-14 (market as the origin).