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Infection Control
Principles of DiseasePrinciples of Disease
TransmissionTransmission
Microorganisms• Small living plant or animal
• Non-pathogens– Live in or on the body– Part of the normal flora– May be beneficial to the body
• Pathogens– Germs– Cause infection
Types of Pathogens
• Bacteria– One celled plants– Classified by shape
and arrangement– Cocci – strep, staph – Bacilli – TB,
tetanus– Spirilla – syphilis,
cholera
• Protazoa– One celled animals– Found in decayed material and contaminated
water– Malaria, dysentery
• Fungi– Simple plant-like
organism
– Live on dead matter
– Yeasts, molds
– Ringworm,athlete’s foot, thrush
Rickettsiae - Parasitic microorganism– Transmitted to
humans through the bite of a tick,fleas, Typhus and lice, mites
– Rocky Mountain spotted fever
• Viruses
– Smallest microorganism
– Can only reproduce inside humans cells
– Colds, chicken pox, warts, influenza, HIV, Hepatitis
Needs of microorganisms
• To Grow– Warmth
– Darkness
– Source of food
– Moisture
– Aerobic need oxygen
– Anaerobic – don’t need oxygen
How Pathogens Cause Infections
• Poisons/toxins– Ex: tetanus
• Allergic Reactions– Ex: runny nose, sneezing
• Attack and Destroy cells they invade– Ex: malaria
Additional Classifications • Endogenous
– Originates inside the body
• Exogenous– Originates outside the body
• Nonsocomial– An infection acquired inside the hospital
• Opportunistic– Infections that occur when the body’s immune
system is weak
Chain of Infection
Asepsis
• Absence of disease-producing microorganisms
• Any area or object containing pathogens is considered contaminated
Levels of aseptic Control
• Antisepsis– Prevent or inhibit
the growth of pathogenic organism but are not effective against spores or viruses.
– Ex: Alcohol/Betadine
Disinfection
• Destroys or kills pathogenic organisms but not always effective against spores or viruses
• Ex: Bleach, Clorox
Sterilization
• The process that destroys all microorganisms both pathogenic and non-pathogenic including spores and viruses.
• Ex: Steam under pressure, autoclave, gas, radiation, chemicals
Most Inexpensive, Quickest, and Effective way to prevent the
spread of pathogens
Standard Precautions
Two Main Ways Pathogens Spread
• Blood– HIV– Hepatitis B– Hepatitis C
• Body Fluids
OSHA• Occupational Safety and Health Administration• 1991 established blood-borne pathogen standard regulations
Regulations
• Determine employees who have occupational exposure
• Provide the Hepatitis B vaccine free
• Provide PPE – Personal Protective Equipment
• Provide adequate hand washing facilities
• Ensure the worksite is maintained in a clean and sanitary condition
Regulations Cont.• Enforce NO eating , drinking, smoking,
applying lip balm or lipstick, handling contact lenses or mouth pipetting in any area potentially contaminated with blood or body fluids.
• Provide adequate sharps containers coded red/orange
• Post signs in areas where there is occupational exposure
• Provide confidential medical evaluation and follow up for any employee with an exposure
• Provide free training for any new updates or changes
Sharps• all needles
• syringes
• syringe bodies
• scalpels
• lancets
• any glass items, such as slides or Pasteur pipettes, that are contaminated with potentially infectious material and/or human blood.
PPE
• Personal
Protective
Equipment
Sterile Technique
• Sterile– Free from all organisms
• Contaminated– Organisms and pathogens are present– Items that touch your clothes or skin or any
area below the waist are considered contaminated
Sterile Field• Never reach across the top of the field
• Reach in from the sides to add to the field
• Never turn your back to a sterile field
• 2 inches around the border are contaminated
• Anything below the level of the tray is contaminated
Methods to Remove Sterile Articles from Sterile Wraps
• Drop Method• Mitten Method• Transfer Forceps
Sterile Field
• Keep Sterile field dry
• Pathogens move quickly through wet surfaces
• Take care when pouring solutions into a sterile field
• When you put on sterile gloves, only handle sterile items
Standards Precaustions
• Used when contacting all patients
Transmission-based Isolation• Airborne
• Droplet
• Contact
• Protective
Communicable Diseases
• A disease caused by a pathogic organism that can be easily transmitted to others
• Spread by – Direct contact with patient– Contact with blood and body fluids– Droplets– Discharge from wounds