Susceptible Host An organism capable of contracting a specific disease
Disease results if the invading pathogen causes Impairment in the host.
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
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
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
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
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
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
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.
As healthcare professionals, it is important to understand two things about infection As healthcare professionals, it is important to understand two things about infection:
1. 1.The various ways infection can be transmitted 2. The ways the infection chain can be broken
There are six links in the chain of infection :
1st - The Pathogen - a pathogen such as bacterium or virus that can cause disease
2nd - The Reservoir -the place where pathogen can live
Common Reservoirs a.Human Body b.Animals c.Environment d.Fomites- nonliving objects such as doorknobs, cups, utensils, needles
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”
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
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
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
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
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
-The essential part of patient care & self-protection. The cycle of infection can be broken at any link of the chain
The infectious agent can be neutralized or destroyed by treatment
The reservoir host must maintain personal hygiene - potential hosts & carriers must practice asepsis & maintain proper personal hygiene
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
The route of transmission is minimized through proper hand washing, disinfection and sterilization and proper disposal of contaminated materials.
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
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
AIDS Transplant Patients Infant & Elderly Patients Cancer patients
Remember--breaking the chain of infection is the responsibility of each health professional.