If you want to avoid catching norovirus, there are some things you can do. Always wash your hands well before preparing and eating food, after using the bathroom or changing nappies, and after touching surfaces that other people have touched. Wash fruit & vegetables before consuming.
If you do happen to catch norovirus, you can help prevent the spread of disease by practicing good hygiene such as washing your hands well, ensuring surfaces are regularly disinfected, and by making sure contaminated items are laundered. You should avoid public places and contact with others when you are unwell, and for a few days after you have recovered as you are still likely to be contagious.