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	0.87	0.86	0.88
Beta - Other lineages	0.89	0.84	0.94
Delta - Other lineages	1.52	1.50	1.53
(Delta-Plus) - Other lineages	1.17	1.07	1.28
Gamma - Other lineages	0.98	0.97	0.99
Epsilon - Other lineages	0.85	0.75	0.95
Mu - Other lineages	1.51	1.22	1.86

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