Why primary complex is not a communicable disease?

The primary complex is not a communicable disease because it is not transmitted from person to person. Primary complex is caused by the bacterium Mycobacterium tuberculosis, which is usually spread through the air from an infected person to a susceptible person. However, in order to develop primary complex, a person must be exposed to a large number of bacteria, and this usually only happens in close contact with an infected person for a prolonged period of time. Therefore, primary complex is not considered to be a communicable disease.