Started Oct 28, 2022 05:00PM UTC   •   Closing Apr 09, 2023 07:01AM UTC

When will the SARS-CoV-2 Omicron subvariant XBB represent more than 70.0% of total COVID-19 cases in the US?

The Omicron subvariant "XBB" has made headlines as a so-called "nightmare" variant that has spread quickly in Asia and beyond (NBC Chicago, Yahoo News, CDC, STAT). The CDC estimates proportions of SARS-CoV-2 lineages circulating in the United States by week here: https://covid.cdc.gov/covid-data-tracker/#variant-proportions. For the week ending 22 October 2022, other Omicron variants represented a combined 100.0% percent share of COVID lineages in the US (see "%Total"). The question would close as of the week for which the threshold is reached—and weeks including "Nowcast" estimates (i.e., columns with "NOWCAST" at the top) would count—or else the week ending 8 April 2023. If the named sourced changes the way it presents the data, we will make the appropriate modifications to the resolution instructions.

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NOTE 11 November 2022: Any XBB sublineages would count. Whether an identified variant is considered to be XBB or a sublineage of XBB is dependent on the classification by the CDC.

NOTE 2 January 2023: The aggregate of XBB and its sublineages (e.g., XBB.1.5) would count.

Possible Answer Crowd Forecast Change in last 24 hours Change in last week Change in last month
The week ending 3 December 2022 or before 0.00% +0.00% +0.00% -1.00%
A week ending between 10 December 2022 and 14 January 2023 0.00% +0.00% +0.00% -73.00%
A week ending between 21 January 2023 and 25 February 2023 95.00% +2.00% +3.00% +77.00%
A week ending between 4 March 2023 and 8 April 2023 4.00% -1.00% -1.00% -1.00%
Not before 9 April 2023 1.00% -1.00% -2.00% -2.00%

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