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Contract tracing and calculation of R0 of rabies transmission between dogs in 2 locations in Tanzania; both locations had R0~1.2 despite large differences in dog density (9 vs 1 dog per km2). Also calculated R0 from published outbreaks in other countries; R0s between 1.05 and 1.85 with no conspicuous relationship along the wide range of dog densities reported for these locations.