When flying, take a cotton bud and put some polysporin in it. Use it to coat the inside rim of the nostrils. This will protect you from 70% of airborne bacteria that might make you sick.
Also, always carry a small bottle of liquid hand sanitizer with you. It not only comes in useful to avoid any nasty germs on the plane but can be great in countries where you might not have access to fresh, clean water.
Tip by: Kate Paterson