The chain of infection
Direct contact occurs through skin-to-skin contact, kissing, and sexual intercourse.
Contact with patient care supplies and equipment and instruments will most likely result in potential contamination and the possibility of disease transfer.
The susceptible host, someone who does not have effective resistance to the pathogenic agent they are exposed to.
Chain of infection ppt
In contrast to droplets that fall to the ground within a few feet, droplet nuclei may remain suspended in the air for long periods of time and may be blown over great distances. Chain of infection The Chain of Infection A series of events has to happen to enable germs when we speak of germs in this section, this refers to bacteria, fungi and viruses to cause infections in a person. The infectious agent The infectious agent is simply the germ that causes the infection. Nonspecific factors that defend against infection include the skin, mucous membranes, gastric acidity, cilia in the respiratory tract, the cough reflex, and nonspecific immune response. An asymptomatic but infected person may be treated both to clear the infection and to reduce the risk of transmission to others. Principles of epidemiology, 2nd ed. Implications for public health Knowledge of the portals of exit and entry and modes of transmission provides a basis for determining appropriate control measures.
The infectious agent The infectious agent is simply the germ that causes the infection. Some strategies that protect portals of entry are simple and effective. Wearing of long pants and sleeves and use of insect repellent are recommended to reduce the risk of Lyme disease and West Nile virus infection, which are transmitted by the bite of ticks and mosquitoes, respectively.
To interrupt vectorborne transmission, measures may be directed toward controlling the vector population, such as spraying to reduce the mosquito population.
Chain of infection definition
To prevent fecal-oral transmission, efforts often focus on rearranging the environment to reduce the risk of contamination in the future and on changing behaviors, such as promoting handwashing. Portal of exit which is the source that allows the pathogen to emerge. In theory, herd immunity means that not everyone in a community needs to be resistant immune to prevent disease spread and occurrence of an outbreak. The infectious agent must be present and pathogenic capable of causing disease and in an infectious dose minimum number needed to cause disease. Finally, some interventions attempt to prevent a pathogen from encountering a susceptible host. For example, influenza virus exits the respiratory tract of the source host and enters the respiratory tract of the new host. Healthcare professionals play a major role in the prevention of disease transmission. Slider image Exercise 1. And if we can break a link at any part of the chain, we can stop infection arising.
Droplet nuclei are dried residue of less than 5 microns in size. Properly performing cleaning and decontamination in healthcare facilities is essential in the prevention of transmission of diseases from one person to another. For example, persons with sickle cell trait seem to be at least partially protected from a particular type of malaria.
When passed human to human, it is transmitted by respiratory droplets, blood contact, semen or other secretions?
Host The final link in the chain of infection is a susceptible host. Frequent reservoirs include supplies and equipment e.
Categories: Article Understanding the chain of infection can help healthcare professionals develop and implement policies and procedures aimed at reducing the risk of infection transmission.
based on 9 review