Infectious Agent: Tuberculosis (TB)
Reservoirs: Humans.
Portals of Exit: Excretion of respiratory secretions. ie. sneezing, coughing, talking, singing.
Modes of Transmission: Airborne. When the pathogen is suspended in the air and another person breaths it into their respiratory system.
Portals of Entry: The TB bacteria enters the human through the respiratory system ie. inhalation of the pathogen.
Susceptible Host: Any human exposed to TB through suspended airborne bacteria. However there are populations at higher risk such as those who are immunocompromised.