Here is a summary of our Wednesday and Thursday lesson, and it is as compressed as I can get it! There is information on 1) The Chain of Infection, 2) what makes a person susceptible, 3) signs of infection, and 4) asepsis, medical and surgical. Enjoy soaking up knowledge J
The chain of infection starts with the host, and as you probably already guessed, the host is the person that is already diagnosed with the infection.
Second is the infectious agent, this is the micro-organism that has started the infection. This agent can be bacteria, viruses, fungi or protozoa (parasite).
Third in the chain is the reservoir or source, and this is the place where the pathogens can survive and supply. A good reservoir is a place that provides food, oxygen, H2O, temperature around 35 degrees Celsius, proper pH (which is in between 5-8), and minimal light.
Portal of Exit is fourth, and this is where the infection exits the body or reservoir. Yes that means any openings, such as the mouth and nose, and the urethral, rectal and vaginal openings. An infection can exit the body also by artificial openings like breaks in the skin and mucus membranes. And don’t forget that infections are carried through blood, bodily fluids, excretions, and secretions.
Fifth, is the Mode of Transmission and there are five different ways that an infection can be transferred to you or others around you.
1) Contact – this can be direct/physical touch, skin to skin, or indirect contact, like the tubing for medical machines like IV tubing. Examples of infections transferred this way are herpes, hepatitis B, C
2) Droplet – large droplets from the respiratory system that are propelled into the air by coughing, sneezing or talking. The droplets can be breathed in causing contamination. Examples are flu, rubella, SARS
3) Air Born – small droplets that contain the infection but are in the air for longer periods of time and can be carried by air currents which transfer the particles, and then a person breathes these particles and become infected if susceptible. Examples are tuberculosis, chicken pox, and measles.
4) Vehicle – single contaminated source like a body of water, food, or blood. And this transmits to multiple hosts resulting in an outbreak. Infections that can be transmitted this way are Hepatitis B, C, HIV, and e.coli.
5) Vector – infection transmitted through insects, or pests. Examples are West Nile, Cholera, and Malaria.
The sixth and last part of the chain is the Portal of Entry. This is where the pathogens enter the body and make a new host. They will use the same openings as the portals of exit, opening of the body.
A susceptible person is one whose body immunities cannot fight off the infectious micro-organisms. A susceptible person is one who has a weak immune system, such as a person who is not vaccinated, the elderly, a baby, or ones who are already trying to fight something with their body such as an HIV/AIDS.
There are many different signs of an infection, some of which are general knowledge such as a fever, pain, and malaise (severe tiredness). Other signs that could be looked for are diarrhea, vomiting, disorientation, and loss of appetite.
The way that we, student nurses, have been taught to prevent transmission and contamination of infections is through asepsis, medical and surgical. Medical asepsis is a clean procure, this would involve gloves, and if needed, cap, gown, goggles/face shield, and possibly slippers. A time when you need to use medical asepsis is say when you are going to get the vital signs of your patient/client. You would need to wear gloves. If though, one had an isolated client, they would have to completely protect themselves with all of the above supplies. Surgical asepsis is a lot more than just ‘clean’, everything needs to be sterile. This means that there can be no micro-organisms. This would be the case in the operating room.
So that was as short of a summary that I could get for Wednesday and Thursday’s lessons any questions or terms that you need defined?