If you are sick or start to see symptoms of illness before your flight, re-think your need to travel and see your doctor. The best way to prevent the spread of any infection is to isolate yourself if you are sick. But, if you must travel while you are sick or start to present symptoms while you are away, then do your best to isolate yourself. Let the cabin crew know that you are feeling unwell and ask if there is an isolated seat available for you.
You should then wear a mask to catch cough or sneeze droplets and change it as soon as it is damp (see above for how). If you don’t have a mask, sneeze or cough into a tissue and put it into a garbage bag straight after. Don’t leave used tissues around as any surface it touches could become infected. If you don’t have a tissue, cough or sneeze into the crease of your elbow. Always sanitise your hands after you sneeze or cough to prevent the spread of droplets to items that you may touch.
It is also a good idea to turn the overhead vents on high if you are unwell. The stream of air will help direct any droplets to the ground as opposed to around you, which will minimise the risk to other passengers.
Lastly, you should disinfect any common surfaces that you come into contact with such as doorknobs and food trays. If you can, place your items straight into the garbage instead of handing them back to the cabin crew to prevent passing any germs onto them. If this isn’t possible, disinfect the items before you hand them over.