Many respiratory diseases are caused by pathogens. A pathogen is an organism that causes disease in another organism. Certain bacteria, viruses, and fungi are pathogens of the respiratory system. The common cold and flu are caused by viruses. The influenza virus that causes the flu is pictured below ( Figure below ). Tuberculosis, whooping cough, and acute bronchitis are caused by bacteria. The pathogens that cause colds, flu, and TB can be passed from person to person by coughing, sneezing, and spitting. Illnesses caused by bacteria can be treated with antibiotics. Those caused by viruses cannot.
Dave and Joy are both experiencing symptoms of a respiratory illness. They both go to the doctor for a check-up and to see what treatments are available. Joy is diagnosed with the flu, and Dave is diagnosed with bronchitis.
Is Dave more or less likely than Joy to be prescribed antibiotics?