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The Chain of Infection How does Infection Occur?.

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Presentation on theme: "The Chain of Infection How does Infection Occur?."— Presentation transcript:

1 The Chain of Infection How does Infection Occur?

2 Microorganisms Small, living organism not visible to the naked eye

3 Pathogens Microorganism that cause disease

4 Susceptible Host An organism capable of contracting a specific disease

5 Disease results if the invading pathogen causes Impairment in the host.

6 Types of Pathogens a.There are different types of pathogens, including: i. Fungi i. Fungi ii. Bacteria ii. Bacteria iii. Viruses iii. Viruses iv. Protozoa iv. Protozoa v. Rickettsiae v. Rickettsiae

7 b. Bacteria i. Single celled organism i. Single celled organism ii. Live in a variety of environments ii. Live in a variety of environments iii. Only 1% cause disease iii. Only 1% cause disease iv. Usually killed by antibiotics iv. Usually killed by antibiotics v. examples of diseases caused by bacteria: v. examples of diseases caused by bacteria: 1. Pneumonias 2. Strep Throat 3. Tuberculosis

8 c. Viruses i. Smallest of pathogens i. Smallest of pathogens ii. Viruses can reproduce only by invading a host cell ii. Viruses can reproduce only by invading a host cell iii. NOT cured by antibiotics iii. NOT cured by antibiotics iv. Examples of diseases caused by viruses iv. Examples of diseases caused by viruses 1. chicken pox 2. colds 3. flu 4. small pox 5. HIV

9 Types of Infections Endogenous- means it originates within the body Examples 1. Metabolic Disorders 2. Birth defects/congenital abnormalities 3. Tumors Exogenous- means it originates outside the body Examples 1. Pathogenic organisms 2. Radiation 3. Chemicals 4. Trauma 5. Electric Shock 6. Temperature extremes

10 Types of Infections Nosocomial- infection is one that is acquired by an individual in a health care facility which are transmitted by health care workers to the patient Opportunistic- infections that occur when the body defense’s are weak

11 Common body Defenses a.Mucous membrane: lines the respiratory, digestive and reproductive tracts b. Cilia: tiny hair like structures that line the respiratory tract to propel pathogens out of the body c. Coughing and Sneezing d. Hydrochloric acid: destroys pathogens in the stomach the stomach e. Tears in eye: contain chemicals that kill bacteria f. Fever: kills pathogens via heat g. Immune response: body produces white blood cells and antibodies to fight pathogens cells and antibodies to fight pathogens

12 Infections are also classified as Aerobic or Anaerobic: Aerobic- means the organism requires oxygen to live Anaerobic- means it lives and reproduces in the absences of oxygen.

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

14 1. 1.The various ways infection can be transmitted 2. The ways the infection chain can be broken

15 There are six links in the chain of infection :

16 1st - The Pathogen - a pathogen such as bacterium or virus that can cause disease

17 2nd - The Reservoir -the place where pathogen can live

18 Common Reservoirs a.Human Body b.Animals c.Environment d.Fomites- nonliving objects such as doorknobs, cups, utensils, needles

19 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. What are “Carrier Hosts”

20 3rd - The Portal of Exit -way for pathogen to escape from the reservoir Pathogens can leave the body through urine, feces, saliva, blood, tears, mucous discharge, sexual secretions, and draining wounds

21 Sneezing

22 4th – The Mode of Transmission -the way that pathogen can be transmitted to a host

23 Transmission may occur through: Direct contact = person to person Examples: sex, saliva/kissing, handshake/touching

24 Indirect Contact =Contaminated substances Examples: food, air, soil, insects, animals, feces, equipment

25 5th - The Portal of Entry - way to enter a new reservoir or host Different portals of entry include: Breaks in the skin or mucous membrane, Respiratory tract, Digestive tract, Genitourinary tract, Circulatory system

26 Respiratory System inhalation

27 Gastrointestinal System ingestion

28 Urinary & Reproductive Tracts Sexual contact

29 Breaks in Protective Skin Barrier

30 6th - TheSusceptible Host 6th - The Susceptible Host -individual who can contract or accept the disease Humans become susceptible if….. a. Large numbers of pathogens invade the body b. Body defenses are weak

31 Organisms with strong immune systems are better able to fend off pathogens. Humans may fight off pathogens and do not contract disease if a. Defense mechanisms of body are intact b. Immune system functioning

32 Organisms with weakened immune systems are more vulnerable to the support & reproduction of pathogens. Human becomes susceptible host in some instances a. Large numbers of the pathogen invade the body b. Body defenses are weak

33 -The essential part of patient care & self-protection. The cycle of infection can be broken at any link of the chain

34 The infectious agent can be neutralized or destroyed by treatment

35 The reservoir host must maintain personal hygiene - potential hosts & carriers must practice asepsis & maintain proper personal hygiene

36 Control Portals of Exit The portal of exit is closed by the use of proper attire (gowns, gloves, other clothing), control of body secretions, and proper hand washing

37 The route of transmission is minimized through proper hand washing, disinfection and sterilization and proper disposal of contaminated materials.

38 Prevent a Route of Transmission Prevent a Route of Transmission The portal of entry is blocked by asepsis, disinfection, and sterilization procedures 1. 1.Proper hand washing 2. 2.Disinfection & sterilization techniques 3. 3.Isolation of infected patients 4. 4.Not working when contagious

39 Protect Portal of Entry Protect Portal of Entry - Host susceptibility is broken when the health and wellness of an individual is maintained. Recognition of Susceptible Host -health professionals must recognize & protect high-risk patients

40 AIDS Transplant Patients Infant & Elderly Patients Cancer patients

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


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