According to the source: "The share may not reflect the complete breakdown of cases, since only a fraction of all cases are sequenced. Recently-discovered or actively-monitored variants may be overrepresented, as suspected cases of these variants are likely to be sequenced preferentially or faster than other cases."
As of January 2022, the share of COVID-19 cases corresponding to the Omicron variant in Spain amounted to nearly 85 percent of the country's analyzed sequences of the SARS-CoV-2 virus. A month earlier this figure was equal to 54 percent of cases studied in the country. The Omicron variant of SARS-CoV-2 - the virus causing COVID-19 - was designated as a variant of concern by the World Health Organization in November 2021. Since then, it has been rapidly spreading, causing an unprecedented increase in the amount of cases reported worldwide.
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OWID. (January 10, 2022). Share of COVID-19 cases in Spain from December 2020 to January, 2022, by variant [Graph]. In ÌÇÐÄÆÆ½â°æ. Retrieved July 21, 2026, from /statistics/1285310/covid-19-variants-spain-share/
OWID. "Share of COVID-19 cases in Spain from December 2020 to January, 2022, by variant." Chart. January 10, 2022. ÌÇÐÄÆÆ½â°æ. Accessed July 21, 2026. /statistics/1285310/covid-19-variants-spain-share/
OWID. (2022). Share of COVID-19 cases in Spain from December 2020 to January, 2022, by variant. ÌÇÐÄÆÆ½â°æ. ÌÇÐÄÆÆ½â°æ Inc.. Accessed: July 21, 2026. /statistics/1285310/covid-19-variants-spain-share/
OWID. "Share of Covid-19 Cases in Spain from December 2020 to January, 2022, by Variant." ÌÇÐÄÆÆ½â°æ, ÌÇÐÄÆÆ½â°æ Inc., 10 Jan 2022, /statistics/1285310/covid-19-variants-spain-share/
OWID, Share of COVID-19 cases in Spain from December 2020 to January, 2022, by variant ÌÇÐÄÆÆ½â°æ, /statistics/1285310/covid-19-variants-spain-share/ (last visited July 21, 2026)
Share of COVID-19 cases in Spain from December 2020 to January, 2022, by variant [Graph], OWID, January 10, 2022. [Online]. Available: /statistics/1285310/covid-19-variants-spain-share/