 M. tuberculosis enters the lung alveoler passages through aerosol droplets, and it then becomes phagocytosed by macrophages.However, since the macrophages are unable to completely kill "M. tuberculosis", granulomas are formed within the lungs, providing an ideal environment for continued bacterial colonization.More than an estimated 30% of the world population is colonized by "Staphylococcus aureus", a microorganism capable of causing skin infections, nosocomial infections, and food poisoning due to its tropism for human skin and soft tissue.