Table 5. Proportion of care home and non-care home samples that were lineage B.1.1.

The proportion of lineage B.1.1 (defined using the Pangolin tool) increased from earlier to later sampling weeks, for both care home and non-care home samples. Data based on the 700 care home residents with genomic data available and 700 randomly selected non-care home samples. ‘Early’ was defined as the period from the start of the study (26th February 2020) to 29th March 2020. ‘Late’ was defined as 20th April 2020 to the end of the study (10th May 2020).

Care home status	Early	Late	% change
Care home resident	6/47 (12.8%)	155/286 (54.2%)	+ 41.40%
Not care home resident	39/173 (22.5%)	50/96 (52.1%)	+ 29.50%