Breathing

Science Daily: Flu may be spread just by breathing - Coughing and sneezing not required for transmission

summary - It is easier to spread the influenza virus (flu) than previously thought, according to a new study. People commonly believe that they can catch the flu by exposure to droplets from an infected person's coughs or sneezes or by touching contaminated surfaces. But, new information about flu transmission reveals that we may pass the flu to others just by breathing.