Use a closed fist or hip to open doors
If you need to open doors, try not to grasp the handle with just your open palm. Instead use a closed fist or your hip, or at least wrap your hand in the end of your sleeve. This is especially important on bathroom and commercial doors, where germs are more easily spread.
You should also use your knuckle or elbow to touch communal objects such as light switches and elevator buttons could be used by many before and after yourself. This will reduce the chances of the infection spreading.
Use disinfectant wipes
This is especially important on communal items such as shopping carts at supermarkets: make sure you wipe the handle as well as the child's seat (if you have one) before use.
Cough or sneeze into a tissue where possible
If you do not have a tissue then the next best alternative is to use your elbow, but do not cough or sneeze into your hands. The clothing you cough into could contain the virus that can be passed to others for up to a week after.
Avoid travel if you have a fever and cough
The WHO have said anyone showing symptoms of COVID-19 should not travel. Instead they should seek medical care and share previous travel history with your GP.