Quiz 3 Flashcards
The study of distribution and determinants of disease and injuries in human populations; cause and effect, patterns of distribution of disease
Epidemiology
The reproduction of an infectious microorganism, but there is no interaction between the body and microorganisms that would result in a detectable immune response
Colonization
Person who is colonized but not ill/no symptoms
Carrier
Ability of an infectious agent to cause clinical disease
Pathogenicity
The severity of a clinical disease, morbidity, etc.
Virulence
6 elements needed to transmit infection
Infectious agent
Reservoir/environment in which the pathogenic microbes can live and multiply
Portal from which to exit the reservoir
Means of transmission
Portal of entry into new host; ex: inhale, swallowing, injected, etc.
Susceptible new host
Something that infiltrates another living thing
Infectious agent
Any person, animal, plant, soil, or substance in which an infectious agent normally lives and multiples
Reservoir/environment
Site through which microorganisms exit/enter the susceptible host and cause disease/infection; ex: mouth, nose, urinary tract, etc.
Portal
Infectious agent moves from source to host
Transmission
2 types of transmission
Direct
Indirect
Disease causing microorganisms pass from actual contact with the infected individual; ex: someone sneezes on you
Direct transmission
Susceptible person is infected from contact with a contaminated surface/object; ex: needle stick
Indirect transmission
Minute, single-cell organism with no nucleus; contains RNA and DNA
Can adapt
Bacteria
3 classifications of bacteria based on shape/appearance
Cocci
Bacilli
Spirilla
Cocci
Spherical
Bacilli
Oblong
Spirilla
Spiral
3 classifications of bacteria based on groups
Diplococci
Streptococci
Staphylococci
Groups of two
Diplococci
Streptococci
Chains
Irregular clusters, hanging grape-like bunches
Staphylococci
4 examples of bacteria
Diphtheria
Tuberculosis (TB)
Streptococcal infections
Chlamydia STD, etc.
Some have both yeast and mold characteristics Usually reproduce by budding/spores Thrive in dark, damp areas Can be harder to treat Ex: thrush, vulvovaginitis, etc.
Fungi
Vulvovaginitis
Yeast infection
2 forms of fungi
Yeast
Mold
Single cell fungi
Yeast
Miniature cell fungi
Mold
Live on or in other organisms at expense of host
Parasites
2 types of parasites
Protozoa
Helminths
More complex single-cell microorganisms, move by cilia action of flagella
Usually in GI tract in people
Ex: amebiasis, malaria from mosquitos, etc.
Protozoa
Infection of intestines by amoeba, usually dysentery from food or drink
Amebiasis
Parasitic worms that commonly affect intestinal tract; some can bee seen with naked eye
Ex: ringworm, tapeworm, pinworm, etc.
Helminths
Minute microorganisms that cannot be visualized by normal microscope, smallest microorganism to infect man
DNA or RNA
Attack host cell, invades and reproduces, and lies dormant or spreads
Once outside body = die immediately in dry form, wet form = die when exposed to heat, and in blood at 4°C = live a couple weeks
Ex: influenza, common cold, mumps, measles, AIDS/HIV, hepatitis A, B, and C, etc.
Viruses
4 microorganisms
Bacteria
Fungi
Parasites
Viruses
4 stages in the process of infection
Incubation period
Prodromal
Disease period
Convalescence period
Pathogen enters body and microbes start reproducing; disease process beginning
Incubation period
More specific symptoms of disease starting, microorganisms increase, and disease is highly infectious
Prodromal
Signs and symptoms reach full extent, when disease is most communicable
Disease period
Symptoms diminish and disappear, can go latent and come back again; ex: herpes, malaria, TB, gonorrhea, etc.
Convalescence period
2 tiers of precautions from CDC (1996)
Tier 1: standard precautions
Tier 2: transmission based precautions
Treat every patient as though they’re infected; use all the time, regardless of diagnosis
Refers to blood, open wounds, secretions (not sweat)/body fluids, intact skin/abrasions, mucous membranes, etc.
Standard precautions
Restrictions used when called for; ex: TB, GI, etc.
Transmission based precautions
3 types of disease transmission by government and 2 more (5 total)
Air: government Droplet: government Contact: government Common vehicle Vector-borne (ex: mosquito)
5 recommended vaccines for health care workers
Hepatitis B Influenza Varicella/chickenpox Pertussis, tetanus, and diphtheria Measles, mumps, and rubella (MMR)
5 transmission routes
Contact Droplet Common vehicle Airborne Vectorborne
Most common transmission route, direct or indirect
Contact
Rapid transfer of infectious agent through air over short distance; ex: sneeze
Droplet
Inanimate object involved in transmission of disease; ex: food, water, medicines, equipment, supplies, etc.
Fomite
Common vehicle
Infectious agent disseminated through air over a long distance, 6 feet to miles away
Airborne
Vector transports infectious agent to host; ex: fly, mosquito, etc.
Vectorborne
Animal that carries and transmits a pathogen capable of causing disease
Vector
Needle sticks account for ___% of job-related acquired HIV; never __________
84%, never recap
8 techniques for infection control
Handwashing proper/best way to prevent disease; up to 40-60 seconds with aseptic technique Dress for the workplace: no jewelry, long or fake nails, etc. Hair short or pulled back Gloves Eye protection Laundry Cleaning and proper waste disposal Disinfection
Condition free from germs
Asceptic
Process that reduces microbial life forms
Process of cleaning, especially with a chemical, in order to destroy bacteria
Disinfection/-ants
10 parts of standard precautions
Hand hygiene Gloves Mask, eye protection, and face shield Gown Needlestick safety Patient care equipment Environmental control Linen Occupation health and bloodborne pathogens Respiratory hygiene/cough etiquette
6 isolation techniques used when a patient is known to have a disease that is contagious
Drainage-secretion precautions Enteric precautions Acid-fast bacillus (AFB) isolation Respiratory isolation Contact isolation Strict isolation
Prevent infections that are transmitted by direct or indirect contact with purulent patient material, drainage, or secretions from an infected site on the body such as abscesses, wound infections, and burns; ex: MRSA
Gown, gloves, dressings bagged in proper containers, 3 minute hand scrubbing for asepsis, separate trash (incinerate infected object)
Drainage-secretion precautions
Prevent infections that are transmitted by direct or indirect contact with fecal material
Bowel, colon, etc.
Dysentery, cholera, etc.
Private room/bathroom, gowns, and gloves
Enteric precautions
Help with privacy, used with pulmonary TB who currently have a positive sputum culture for acid fast bacilli or a chest x-ray that reflects active TB (airborne)
Fitted mask, gowns if gross contamination, gloves, and private room with special ventilation closed door
Acid-fast bacillus (AFB) isolation
Isolation technique when spread by droplet contact as patient talks, coughs, or sneezes
Meningitis, flu, measles, mumps, etc.
Private room, masks, gowns, and gloves
Respiratory isolation
Used for diseases spread by close or direct contact, present microbes
Indirect: infected person touches object or not infected person, fomite
Acute respiratory infection pneumonia, etc/.
Masks, gowns, gloves, and private room
Contact isolation
Used for patients with diseases transported by airborne or contact route, highly infectious and spread is hard to control
Combination of protective and reverse isolation
Pharyngeal diphtheria (throat), plaque, chickenpox, etc.
Negative pressure room, mask, gown, gloves, hand washing and decontamination of items, and private room or with patient who has disease
Strict isolation
Isolation for immunocompromised patient
Negative pressure room
Reverse isolation
Process that destroys all microbial life forms including resistant spores, done by physical or chemical process
Sterilization
3 levels of disinfectants
High-level disinfection (HLD)
Intermediate-level disinfection
Low-level disinfection
Eliminates all microbial forms when there’s a high level of bacterial spores, ex: anthrax
High-level disinfection (HLD)
Kills TB bacteria, most viruses, fungi, but not bacterial spores
Intermediate-level disinfection
Sanitation; activates most bacteria, some viruses, and fungi, doesn’t work against TB or bacterial spores
Low-level disinfection
Antimicrobial substance on skin surface
Antiseptic
4 vital/cardinal signs
Body temperature
Pulse
Respiration
Blood pressure (BP)
Brain can’t survive/function for ___-___ minutes without oxygen
4-5 minutes
Result from metabolic activity must be stable in order for the body’s cellular and enzymatic activity to remain efficient
Temperature
Fever leads to increased pulse and respiration, general discomfort, achiness, flush, dry skin that feels hot, chills, loss of appetite, etc.
Pyrexia
Excessively high temperature of 105.8°F or 41°C
Hyperpyrexic
Temperature less than 34°C, death
Hypopyrexic