1. The Chain of Infection

2. As healthcare professionals, it is important to understand two things about infection:

3. the various ways infection can be transmitted
2. the ways the infection chain can be broken

4. There are six links in the chain of infection :

5. 1st - The Infectious Agent
-any disease-causing microorganism (pathogen)

6. -the organism in which the infectious microbes reside
2nd - The Reservoir Host
-the organism in which the infectious microbes reside

7. What are “Carrier Hosts”
Hosts that do not show any outward signs or symptoms of a disease but are still capable of transmitting the disease are known as carriers.

8. -route of escape of the pathogen from the reservoir.
3rd - The Portal of Exit
-route of escape of the pathogen from the reservoir.
Examples: respiratory secretions, blood exposure, breaks in skin

9. 4th - The Route of Transmission
-method by which the pathogen gets from the reservoir to the new host

10. Transmission may occur through:
direct contact

11. air

12. insects

13. 5th - The Portal of Entry
-route through which the pathogen enters its new host

14. Respiratory System
inhalation

15. Gastrointestinal System
ingestion

16. Urinary & Reproductive Tracts
Sexual contact

17. Breaks in Protective Skin Barrier

18. 6th - The Susceptible Host
-the organism that accepts the pathogen
The support of pathogen life & its reproduction depend on the degree of the host’s resistance.

19. Organisms with strong immune systems are better able to fend off pathogens.

20. Organisms with weakened immune systems are more vulnerable to the support & reproduction of pathogens.

21. How to interrupt the chain of infection:
-The essential part of patient care & self-protection.

22. 1. Pathogen Identification
-identification of infectious agent & appropriate treatment

23. 2. Asepsis & Hygiene
-potential hosts & carriers must practice asepsis & maintain proper personal hygiene

24. 3. Control Portals of Exit
-healthcare personnel must practice standard precautions:

25. (Control body secretions & wash hands according to protocol.)

26. 4. Prevent a Route of Transmission
-prevent direct or indirect contact by:
Proper handwashing
Disinfection & sterilization techniques
Isolation of infected patients
Not working when contagious

27. 5. Protect Portal of Entry
-Health professionals must make sure that ports of entry are not subjected to pathogens.
(nose, mouth, eyes, urinary tract, open wounds, etc.)

28. 6. Recognition of Susceptible Host
-health professionals must recognize & protect high-risk patients

29. Cancer Patients
AIDS Patients
Transplant Patients
Infant & Elderly Patients

30. Remember--breaking the chain of infection is the responsibility
of each health professional.