What are the Factors Which Lower the Defense Mechanism of the Body and Cause Tuberculosis?
After the primary complex has been formed, i.e. when the patient is already infected, he gets additional protection against subsequent invasion by tubercle bacilli. This is the characteristic feature only of this bacterial infection. Hence, whenever tubercle bacilli invade a healthy person, who is previously infected, i.e., has a primary complex in his body, the tubercle bacilli, as they enter the lungs / alveoli/ air sacs are likely to be killed by the various immune responses of the body. But this is not as simple as it looks like. On the contrary, tuberculosis does occur in many cases, since the defense mechanism of the body gets paralyzed in one way or the other. The defense mechanism of the body may be markedly impaired when a patient is suffering from a general disease like diabetes, occupational diseases of the lungs like asbestosis (due to inhalation of asbestos particles), anthracosis (due to coal dust inhalation), silicosis (due to inhalation of stone dust), etc. Similarly, A
