Superspreading | Iris Lab

Parameters

R₀ (mean reproduction): 2.0 Dispersion k (lower = more super): 0.10 Population size: 200

Statistics

Dispersion k0.10

% who cause 80% spread—

P(0 secondary cases)—

Outbreak size—

Superspreading arises when transmission is overdispersed. Negative binomial with small k: most cases infect nobody, a few cause explosive clusters. SARS-CoV-1 k≈0.16, COVID-19 k≈0.1.