COVID-19 Variant Dashboard

Last content update: 9/26/22

COVID-19 Variant Report

This dashboard provides the cumulative count of COVID-19 variants that have been identified and reported in Santa Clara County to date.

Since the start of the pandemic, multiple variants of SARS-CoV-2 have appeared, which is common as all viruses change and mutate over time. Most variants do not have significant health impacts, but some may affect COVID-19 transmission, disease severity, testing, treatment, or vaccine effectiveness, and should be routinely monitored.  Vaccine effectiveness and variants continue to be monitored and studied nationally and globally. For information on vaccinations in Santa Clara County please visit our vaccination dashboard

Santa Clara County follows the CDC SARS-CoV-2 classification scheme and definitions, which includes four classes of SARS-CoV-2 variants:

  • Variant of High Consequence (VOHC) is used to describe a variant for which there is clear evidence that prevention or medical countermeasures have reduced effectiveness.
  • Variant of Concern (VOC) is used to describe a variant that has already been found to have a significant impact on health, such as being more contagious, more likely to cause severe illness, or less responsive to vaccines or treatment.
  • Variant of Interest (VOI) is used to describe a variant which has been associated with significant genetic changes and may require appropriate public health actions.
  • Variant Being Monitored (VBM) is used to describe all variants with substitutions of concern, including previous VOIs and VOCs, in the United States that are currently being monitored by the CDC to learn more about their public health impact, but are not thought to pose a significant or impending risk to the public.

As CDC and others discover and designate new variants, they will be added to this dashboard. As more information becomes known about particular variants, their designations and thus the number of variant sequences, may change.


Known Variants of High Consequence in Santa Clara County



Known Variants of Concern in Santa Clara County

Variant WHO Label Number of Variant Sequences
B.1.1.529* Omicron 2,607
BA.1.1 Omicron 10,818
BA.2* Omicron 2,736
BA.2.12.1 Omicron 1,312
BA.2.75 Omicron 9
BA.4* Omicron 256
BA.4.6 Omicron 20
BA.5* Omicron 1,398
BF.7 Omicron 2
Recombinant Omicron 15

*Includes all sublineages (BA.1 and BA.3 for B.1.1.529, BA.2.12 for BA2)


Known Variants of Interest in Santa Clara County



Known Variants Being Monitored in Santa Clara County

Variant WHO Label Number of Variant Sequences
B.1.617.2* Delta 16,302
B.1.1.7* Alpha 744
B.1.351* Beta 20
P.1* Gamma 156
B.1.427/B.1.429 Epsilon 1,456
P.2 Zeta 4
B.1.525 Eta 4
B.1.526 lota 60
B.1.617.1 Kappa 29
B.1.621* Mu  48

*Includes all sublineages (AY. for B.1.617.2, Q for B.1.1.7; B.1.351.2/B.1.351.3 for B.1.351; P.1.1/P.1.2 for P.1; B.1.621.1 for B.1.621) 


Effective 7/11/2022, the primary data source for this dashboard has changed to the California Department of Health (CDPH) SARS-CoV-2 Dashboard to better align with the state’s information and evolving designations of sequence lineages.

The dashboard has also been updated with the following:

  • Omicron subvariants and recombinants have been separated out

This dashboard is updated every Monday. Please note that there is a lag in the data of up to a month or more due to the time required for laboratories to sequence and report variant cases to the Public Health Department.

Source: California Department of Public Health (CDPH) SARS-CoV-2 dashboard; the CDPH dashboard includes sequence data from multiple sources including routine genomic surveillance conducted through County of Santa Clara Public Health Lab, the California Department of Public Health, academic partners, and commercial laboratories. 

Data included in this dashboard only represent sequences of cases reported or known to the County of Santa Clara Public Health Department. As a result, sequence counts presented in this dashboard do not represent the total number of infections due to variant strains that may be circulating in Santa Clara County. Sequence counts reported in this dashboard are preliminary and are subject to change upon further investigation.

For more information on which variants the California Department of Public Health (CDPH) is tracking and on the number of cases per variant reported across California, see the CDPH website on Tracking Variants.

Where to find more information

Click here to return to main COVID-19 Data and Reports page

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