Before germs were first spied under a microscope by Robert Koch, a doctor from East Prussia, catching colds was blamed on evil spirits, foul weather, and medical enigmas such as blood impurities. Koch ...

(The Conversation) – It starts with a slight scratchiness at the back of your throat. Then, a sneeze. Then coughing, sniffling and full-on congestion, with or without fever, for a few insufferable ...