Chain of infection is made of six sequential link: infection agent, reservoir, portal of exit, mode of transmission, portal of entry and the susceptible host. By identifying the components and breaking any link in the chain can disrupt the cycle therefore an infectious disease is unlikely to be transmitted. The components of the chain may vary as it depends on the microbe and pathogens. Nevertheless, there are various types of microbes and infectious internal and external of the healthcare system. In spite of the bacteria or viruses, germs can be transmitted to a new person through a common series of events.
