This is a series of weekly maps showing the changing locations and distribution of residence buildings and schools with confirmed swine flu cases in Hong Kong over a nine-week period, ever since the first case was reported in the territory. Data for the map were collated from media reports and uploaded statistics of the Centre for Health Protection (CHP www.chp.gov.hk) up to 26 June, the last day that a 'building list' was made available on the CHP website.