Alliance for Pandemic Preparedness

May 5, 2021

Identification of and Surveillance for the SARS-CoV-2 Variants B.1.427 and B.1.429 — Colorado, January–March 2021

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  • The SARS-CoV-2 B.1.427/B.1.429 variant (aka CAL.20C), a variant of concern/interest (VOC/VOI) first described in California, was first detected in Colorado in late January 2021, and increased from 3-4% of all sequenced infections in late January to 20-22% in early March. Cases were dispersed across nearly half of counties. Among 60 cases who completed enhanced interviews, 9 reported travel outside of Colorado, 3 of which were to California. Based on available data, infection after vaccination occurred in 7 cases (2%). 

Martin Webb et al. (May 5, 2021). Identification of and Surveillance for the SARS-CoV-2 Variants B.1.427 and B.1.429 — Colorado, January–March 2021. MMWR. Morbidity and Mortality Weekly Report. https://doi.org/10.15585/mmwr.mm7019e2