Volume 28, Supplement—December 2022
SUPPLEMENT ISSUE
Surveillance
Determining Gaps in Publicly Shared SARS-CoV-2 Genomic Surveillance Data by Analysis of Global Submissions
Table 3
Geographic distribution of Alpha, Delta, and Omicron SARS-CoV-2 sequences before dates of selected international public health actions, based on data from GISAID and GenBank, 2020–2021*
Variant | International action (date implemented) | Sequences collected before that date | Geographic diversity of origin | Sequences submitted before that date (% of total collected) | Geographic diversity of origin |
---|---|---|---|---|---|
Alpha |
International travel restrictions (14) (2020 Dec 19)† |
11,586 |
48 countries (5 continents) |
1,872 (16) |
4 countries (2 continents) |
Delta |
WHO-designated VOC (2) (2021 May 11) |
28,257 |
116 countries (6 continents) |
2,257 (8.0) |
39 countries (5 continents) |
Delta |
CDC-designated VOC (15) (2021 Jun 15)‡ |
121,071 |
137 countries (6 continents) |
46,946 (39) |
66 countries (6 continents) |
Omicron | WHO-designated VOC (2); international travel restrictions (16) (2021 Nov 26) | 1,365 | 48 countries (6 continents) | 76 (5.6) | 3 countries (2 continents) |
*CDC, United States Centers for Disease Control and Prevention; GISAID, https://www.gisaid.org; VOC, variant of concern. WHO, World Health Organization. †WHO designated Alpha a variant of concern on December 18, 2020 (2). ‡Several countries implemented (Germany, Hong Kong, Lithuania, Slovakia, Belgium) or extended (United States) travel restrictions due to Delta during June or July 2021.
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