Variant Classification | World Health Organization
Variant of Concern (VOC)
  • Easier to spread
  • More severe disease
  • Harder to detect
  • Vaccination and infection produce less effective antibodies
77% of sequenced cases in Nevada are VOC
Variant of Interest (VOI)
  • Causes an increased proportion of cases or unique outbreak clusters
  • Predicted to impact transmission, testing, treatments, or immune responses
1% of sequenced cases in Nevada are VOI
Variant being Monitored (VBM)
  • Effective types of medical countermeasures can be used
  • Circulating at low levels



1% of sequenced cases in Nevada are VBM
Variant of High Consequence (VHC)
  • Clear evidence that prevention measures are ineffective compared to previous variants


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Variants of Concern
Delta
B.1.617.2 • AY.1 • AY.2 • AY.3 • AY.3.1 • AY.4 • AY.4.1 • AY.4.2 • AY.4.2.1 • AY.4.2.2 • AY.4.3 • AY.4.4 • AY.4.5 • AY.4.6 • AY.5 • AY.5.1 • AY.5.2 • AY.5.3 • AY.5.4 • AY.6 • AY.7 • AY.7.1 • AY.7.2 • AY.8 • AY.9 • AY.9.1 • AY.9.2 • AY.9.2.1 • AY.10 • AY.11 • AY.12 • AY.13 • AY.14 • AY.15 • AY.16 • AY.16.1 • AY.17 • AY.18 • AY.19 • AY.20 • AY.20.1 • AY.21 • AY.22 • AY.23 • AY.23.1 • AY.23.2 • AY.24 • AY.25 • AY.26 • AY.27 • AY.28 • AY.29 • AY.29.1 • AY.30 • AY.31 • AY.32 • AY.33 • AY.34 • AY.34.1 • AY.34.1.1 • AY.34.2 • AY.35 • AY.36 • AY.37 • AY.38 • AY.39 • AY.39.1 • AY.39.1.1 • AY.39.2 • AY.40 • AY.41 • AY.42 • AY.43 • AY.43.1 • AY.43.2 • AY.43.3 • AY.43.4 • AY.44 • AY.45 • AY.46 • AY.46.1 • AY.46.2 • AY.46.3 • AY.46.4 • AY.46.5 • AY.46.6 • AY.47 • AY.48 • AY.49 • AY.50 • AY.51 • AY.52 • AY.53 • AY.54 • AY.55 • AY.56 • AY.57 • AY.58 • AY.59 • AY.60 • AY.61 • AY.62 • AY.63 • AY.64 • AY.65 • AY.66 • AY.67 • AY.68 • AY.69 • AY.70 • AY.71 • AY.72 • AY.73 • AY.74 • AY.75 • AY.75.1 • AY.75.2 • AY.75.3 • AY.76 • AY.77 • AY.78 • AY.79 • AY.80 • AY.81 • AY.82 • AY.83 • AY.84 • AY.85 • AY.86 • AY.87 • AY.88 • AY.89 • AY.90 • AY.91 • AY.91.1 • AY.92 • AY.93 • AY.94 • AY.95 • AY.96 • AY.97 • AY.98 • AY.98.1 • AY.99 • AY.99.1 • AY.99.2 • AY.100 • AY.101 • AY.102 • AY.103 • AY.104 • AY.105 • AY.106 • AY.107 • AY.108 • AY.109 • AY.110 • AY.111 • AY.112 • AY.113 • AY.114 • AY.115 • AY.116 • AY.116.1 • AY.117 • AY.118 • AY.119 • AY.120 • AY.120.1 • AY.120.2 • AY.120.2.1 • AY.121 • AY.121.1 • AY.122 • AY.122.1 • AY.123 • AY.124 • AY.125 • AY.126

  • Total Sequenced: 12,904
  • First Seen: 04/21/2020
  • Last Seen: 12/29/2021

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    Omicron
    B.1.1.529 • BA.1 • BA.2 • BA.3

  • Total Sequenced: 312
  • First Seen: 12/08/2021
  • Last Seen: 12/29/2021

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    Alpha
    B.1.1.7 • Q.1 • Q.2 • Q.3 • Q.4 • Q.5 • Q.6 • Q.7 • Q.8

  • Total Sequenced: 770
  • First Seen: 01/04/2021
  • Last Seen: 08/12/2021

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    Beta
    B.1.351 • B.1.351.1 • B.1.351.2 • B.1.351.3 • B.1.351.4 • B.1.351.5

  • Total Sequenced: 17
  • First Seen: 02/16/2021
  • Last Seen: 06/07/2021

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    Gamma
    P.1 • P.1.1 • P.1.2 • P.1.3 • P.1.4 • P.1.5 • P.1.6 • P.1.7 • P.1.8 • P.1.9 • P.1.10 • P.1.10.1 • P.1.10.2 • P.1.11 • P.1.12 • P.1.13 • P.1.14 • P.1.15 • P.1.16 • P.1.17 • P.1.17.1

  • Total Sequenced: 134
  • First Seen: 03/29/2021
  • Last Seen: 08/08/2021

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    Variants of Interest
    Lambda
    C.37 • C.37.1

  • Total Sequenced: 3
  • First Seen: 06/07/2021
  • Last Seen: 06/08/2021

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    Mu
    B.1.621 • B.1.621.1

  • Total Sequenced: 66
  • First Seen: 05-01-2021
  • Last Seen: 08-15-2021

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    Variants under Monitoring
    C.1.2: Not Detected


  • Total Sequenced: -
  • First Seen: -
  • Last Seen: -

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    Eta
    B.1.525

  • Total Sequenced: 1
  • First Seen: 04/20/2021
  • Last Seen: 04/20/2021

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    Iota
    B.1.526 • B.1.526.1 • B.1.526.2 • B.1.526.3

  • Total Sequenced: 99
  • First Seen: 02/01/2021
  • Last Seen: 08/07/2021

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    Kappa: Not Detected
    B.1.617.1

  • Total Sequenced: -
  • First Seen: -
  • Last Seen: -

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    B.1.617.3: Not Detected


  • Total Sequenced: -
  • First Seen: -
  • Last Seen: -

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    Theta: Not Detected
    P.3

  • Total Sequenced: -
  • First Seen: -
  • Last Seen: -

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    B.1.1.318-related
    B.1.1.318 • AZ.1 • AZ.2 • AZ.2.1 • AZ.3 • AZ.4 • AZ.5 • AZ.6

  • Total Sequenced: 89
  • First Seen: 03/02/2021
  • Last Seen: 07/26/2021

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    C.36.3-related: Not Detected
    C.36.3 • C.36.3.1

  • Total Sequenced: -
  • First Seen: -
  • Last Seen: -

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