Influenza and pneumonia are a leading cause of death in the US. The two diseases are traditionally reported together because pneumonia is frequently a complication of influenza. Influenza is a contagious disease caused by a virus. The number of influenza deaths can fluctuage considerably from one year to the next as influenza can be caused by more virulent virus strains in some years than others as the viruses constantly mutate. Pneumonia is a serious infection of the lungs that develops when the immune system is weakened. It is mainly caused by bacteria, viruses and mycoplasmas. Typically there are more deaths from pneumonia than from influenza.
This indicator shows the age-adjusted death rate per 100,000 population due to influenza and pneumonia.