From the Wellcome Trust, this animation shows how the human immune system attempts to contain a tuberculosis infection and how the bacteria are transmitted to new people.
Tuberculosis usually affects the respiratory system but it can develop in any part of the body. The human immune system commonly contains the infection but a dormant infection can progress into serious disease. In the lungs, the spread of bacteria can cause damage to the air sacs and other parts of the respiratory system. This damage can prove fatal, especially in the elderly or very young.
The animation is suitable for use with students aged 11-16 as an illustration of a bacterial disease. In older students it can be used as a reminder of the pathology of tuberculosis.