O-23 - Individual infectiousness is highly overdispersed across eight directly-transmitted diseases; SARS dispersion k approx 0.16
Empirical offspring distributions from detailed contact-tracing/surveillance datasets for eight directly-transmitted diseases; negative binomial(R0,k) has variance R0(1+R0/k), so smaller k means greater heterogeneity (k→inf Poisson, k=1 geometric).
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Why this is evidence
High individual-level overdispersion means a chance superspreading event can manufacture an apparent market cluster without the market being the origin — raising the amplifier/artifact readings (H-15/H-19) relative to a true market origin (H-14).