I think the word you are looking for is "Mucus"
Simple hygene can go a long way to stopping the spread of Flu, like washing your hands, not touching your eyes / nose / mouth too much, obviously keeping away from places where the bugs manifest themselves, Cinemas , Doctors surgeries etc etc.
Also, workplace "heroes", those that stick it out when they are ill are a great source of spreading bugs.
Simple hygene can go a long way to stopping the spread of Flu, like washing your hands, not touching your eyes / nose / mouth too much, obviously keeping away from places where the bugs manifest themselves, Cinemas , Doctors surgeries etc etc.
Also, workplace "heroes", those that stick it out when they are ill are a great source of spreading bugs.