301 YOUR HEALTH What happens when you cough or sneeze When you cough or sneeze you send whizzing into space tens of thousands of tiny droplets of moisture. If you have a cold, each drop- let contains the germs of that cold. This is not mere theory, for these droplets have been photographed. If you cough or sneeze over or near other people, you spray them with your droplets containing your germs, and so spread your infection. If you cough or sneeze in a crowded room, or in a bus or tram or rail- way carriage, you will broadcast your germs.