When any pathogen invades the body, it has to pass several lines of defence. The first barrier is the skin and mucous membrane which is a physical and chemical barrier. The second line of defence is the non-specific response by macrophages, neutrophils and interferon. After crossing these two barriers the third line of defence comes into action in which, the B- cells and T-cells act specifically on the pathogen and destroy it.
When first and second line of defense is passed by the bacteria, the third line of defense will come into action which is a biological barrier which includes antigen which are anti-bodies generating substances.
It's like walking ten meters to the left, then walking thirty meters to the right. The result is walking 20 meters to the right. It's the same with force.
<span>When an acid-fast bacillus is isolated and produces an orange pigment when grown in either the light or the dark, the type of organism that has most likely been isolated are Phychomyces a cyanobacteria.</span>