Staff from the management office at Cheung On Estate, Tsing Yi, where the Ko family lives, clean rubbish bins and a corridor. The block housing the family apartment was washed and disinfected on Wednesday night and again yesterday. Neighbours of the family were attempting to keep a low profile yesterday. Many said they knew nothing about the family, while others refused interviews. No one answered the door at the flat. One neighbour said his family kept all their windows open and disinfected their floors with bleach. 'But there's not much to be afraid of really,' said Mr Lam, who lives opposite the Kos.