Crynodeb o'r cais

This analysis uses data from the COVID-19 Infection Survey for the fortnight, 29 November 2021 to 12 December 2021.

These early results show the characteristics of people more likely to be infected with the Omicron variant compared with the Delta variant.

These early results are based on the first fortnight’s data that have sufficient cases for analysis on the Omicron variant, so caution is advised.


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Please note the attached file was updated on 23 December 2021. The previous sample size calculated was 1,701, the correct figure is 1,816.