A popular model used to understand the infection process is the chain of infection, a circle of links, each representing a component in the cycle. Each link must be present and in sequential order for an infection to occur. The links are: infectious agent, reservoir, portal of exit from the reservoir, mode of transmission, and portal of entry into a susceptible host.Understanding the characteristics of each link provides the dental professional with methods to support vulnerable patients and to prevent the spread of infection. An awareness of this cycle also provides the worker with knowledge of methods of self-protection.
For example, by focusing on the transmission chain, direct or indirect contact may be interrupted by proper hand washing and strict attention to disinfection and sterilization techniques.
Ref. City Colleges of Chicago, Infection Control for Nursing Students
