WHO Situation report 144 25.5. 2023 Merkittävien kiertävien koronavirusvarianttien prevalenssikäyrät

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SARS-CoV-2 variants of interest and variants under monitoring
Geographic spread and prevalence
Globally, from 24 April to 21 May 2023 (28 days), 25 415 SARS-CoV-2 sequences were shared through GISAID.
WHO is currently monitoring two variants of interest (VOIs), XBB.1.5 and XBB.1.16, along with seven variants
under monitoring (VUMs) and their descendent lineages: BA.2.75, CH.1.1, BQ.1, XBB, XBB.1.9.1, XBB.1.9.2, and
XBB.2.3.
Globally, XBB.1.5 has been reported from 113 countries. In epidemiological week 18 (1 to 7 May 2023), XBB.1.5
accounted for 41.6% of sequences, a decrease from 50.4% in epidemiological week 14 (3 to 9 April 2023).
XBB.1.16 has been reported from 58 countries. In week 18, XBB.1.16 accounted for 13.2% of sequences, an
increase from 6.9% in week 14.
Table 2 shows the number of countries reporting the VOIs and VUMs and their prevalence from week 14 to
week 18. Among the VUMs, XBB, XBB.1.9.1, XBB.1.9.2, and XBB.2.3 have shown increasing trends in recent weeks. Other VUMs show declining trends during the same reporting period. VOI and VUMs that have shown
increasing trends are highlighted in orange, and those with decreasing trends are highlighted in green.
Table 2. Weekly prevalence of SARS-CoV-2 VOIs and VUMs, week 14 to week 18 of 2023
Lineage  Countries§   Sequences§    2023-14, 2023-15, 2023-16, 2023-17, 2023-18
XBB.1.5* (VOI) 113 c.  227033 seq   50.44      49.44     46.41     45.65          41.57
XBB.1.16* (VOI) 58 c.   11857  seq     6.92       8.55     10.01     10.73          13.17
BA.2.75*           123  c.111031  seq      3.28      2.84       2.42        1.00            1.17
CH.1.1*               91 c.  45949  seq      3.85       3.77      3.15        2.86            2.26
BQ.1*                149 c. 410340  seq      3.73       2.83      2.06        1.42            0.75
XBB*                 127 c.   67073 seq      6.28       6.76       7.21       9.02          10.80
XBB.1.9.1*          84  c.  26149  seq   10.57      11.93      13.34    14.79          15.65
XBB.1.9.2*          58  c.    6805  seq     2.65        3.25        4.14      4.77            5.15
XBB.2.3*             52  c.    3657  seq     1.95        2.18        2.52      2.88           3.59
Unassigned       103 c.  149154 seq     2.13      1.26        0.93      0.03            -
Other+               207c.  6710043 seq    6.14      6.40        7.28      8.16             7.94
* Includes descendant lineages, except those individually specified elsewhere in the table. For example, XBB* does not include XBB.1.5, XBB.1.9.1,
XBB.1.9.2, XBB.1.16, and XBB.2.3.
+ Others are other circulating lineages excluding the VOI, VUMs, BA.1*, BA.2*, BA.3*, BA.4*, BA.5*.
§ Countries and sequences are since the emergence of the variants
Additional resources
• Tracking SARS-CoV-2 Variants
• WHO statement on updated tracking system on SARS-CoV-2 variants of concern and variants of interest
• WHO XBB.1.16 Initial Risk Assessment, 17 April 2023
• WHO XBB.1.5 rapid risk assessment, 24 February 2023