SARS-CoV-2 Fitness Tracker for North Carolina

Below represents the fitted variant progression in North Carolina.

Figure 1: Proportion of SARS-CoV-2 Variants in Circulation (Fitted)

The below table represents the estimate growth rate advantages of the different variants over wild-type variants. Values greater than one indicate an advantage over the wild-type. This assumes a generation time of 4.7 days.

Fitness Advantages Over Wild-Type

Contrast	Estimate	Lower	Upper
Alpha - Other lineages	0.76	0.75	0.78
Beta - Other lineages	0.90	0.87	0.94
Delta - Other lineages	1.28	1.27	1.28
(Delta-Plus) - Other lineages	1.09	1.02	1.15
Gamma - Other lineages	0.89	0.87	0.91
Epsilon - Other lineages	0.90	0.87	0.94
Mu - Other lineages	1.44	1.29	1.62
Omicron - Other lineages	1.13	1.10	1.17

Figure 2: Fitness Advantages of SARS-CoV-2 Variants