Fig. 3

Genomic assessment of public health measures put in place to prevent the spread of SARS-CoV-2 in LA County. A Effective reproductive number (Re) quantified across time using all B.1.43 strains from LA County. These genomes were inferred to have arisen from a single introduction event. The grey ribbon shows the 95% highest posterior density (HPD) credible interval for our estimates of Re. The vertical lines depict the time when some public health measures were put in place in LA County. The ‘Safer at Home’ order issued for LA County put in place on March 20, 2020 (red). LA City required masks to be worn when visiting essential businesses on April 7th, 2020 (blue). B-C Convergence data for the two effective reproductive number parameters from one MCMC run. The y-axis shows the value of the effective reproductive number throughout the MCMC run. The x-axis is the state in the chain. B shows the parameter from the first time period. C shows the parameter for the second time period