--E. Coli and MRSA on the tray table. Microbiologists found these two everywhere when they swabbed down flights. Bring your own disinfecting wipes.--Bed bugs in the seat. British Airways fumigated two planes after a passenger posted pictures online about her experience. Wrap clothes in plastic and wash them.
--Sick seatmates. Everyone has experienced (or been) this person. Wash your hands.
--Deep vein thrombosis. Tennis star Serena Williams experienced a pulmonary embolism, possibly related to recent foot surgery. But DVT can happen to anyone restrained to a cramped position for long periods of time. Move around in-flight (but not during the beverage service, of course.)
--Dehydration. Dry cabin air may make it more difficult to fight off infections. Drink more water.
