An airborne disease is caused by droplets of pathogens which are expelled into the air by coughing, sneezing or talking. The relevant pathogens may be viruses, bacteria, or fungi. Many common infections can spread by airborne transmission are tuberculosis, influenza, small pox. Waterborne diseases are caused by pathogenic microorganisms and most commonly transmitted through contaminated fresh water. Infections can be spread by bathing, washing, drinking, in the preparation of food, or the consumption of food thus infected.