Chapter 21: Respitory Infections Flashcards
Streptococci can be classified based on cell wall carbohydrates by this method
Lancefield grouping
Which is better predictor of disease causing potential
Hemolysis or Lancefield
Lancefield
Eyes and ears associated with ducts to nasal cavity,throat are included in upper respitory
True ir false
True
Goblet cells produce
Mucus
Nose and nasal cavity does this to inspired air
Warm and humidity
Pharyngitis is inflammation of
Throat
Pleomorphic, club shapped Gram-positive rods non mobile
Aerobic/ facultative
Diphtheria
Corynebacterium
Gram-negative rods
Obligate anaerobe
Found in teeth and gums
Fusobacterium
Porphyromonas
Prevotella
Small gram negative rods
Facultative anaerobe
H. Infulenza
Haemophilus
Gram-negative diplococci and diplobacilli
Aerobic some resemble pathogen
Neisseria species N. Meningitidis
Moraxella
Gram-positive cocci in clusters
Facultative anaerobe
Potential pathogen S. aureus commonly in nostrils
Staphylococcus
Gram-positive Cocci in chains
Potential pathogen S. pneumonia
Streptococcus
External ear up to ear drum protected by
Cerumen
Middle ear connected by _______ to nasal pharynx to allow drainage
Eustachian tube
Otitis media is
Infection of ear drum
Larynx, trachea, bronchi, bronchioles, lungs make up
Lower respitory tract
Eyes, Ears, nose, pharynx make up
Upper respitory tract
Larynx is aka
Voice box
Trachea is aka
Wind pipe
Trachea branches into two ___
Bronchi
When alveoli fill with pus and fluid it is called
Pneumonia
Pleura is
The 2 membranes surrounding the lungs
Conjunctivitis is aka
Pink eye
H. influenza & S. pneumoniae often cause
Conjunctivitis (pink eye)
Otitis media (ear ache)
Sinusitis (sinus infection)
Streptococci Pharyngitis aka strept throat is caused by
Streptococcus pyogenes
Gram-positive grows in chains
B-hemolysis
Group A streptococci (lancefield)
Streptococcus pyogenes
M protein, Protein F, & Enzymes allow for evasion of host defense in this species
Strep pyrogenes
Some species of S. pyrogenes produce _____ leading to
High / scarlet fever
Toxic shock syndrome
Flesh eating disease
Streptococci pyrogenes Extotoxins
Acute post-streptococcal can lead to
Glomerulonephritis
Diphtheria is this type of disease
Toxin-mediated
Corynebacterium is the causative agent of …
Diphtheria
Diphtheria is an A-B exotoxin describe the A & B subunits
A = catalyzes reaction
B = binding
Diphtheria
Epidemiology ___ are the primary reservoir
Humans
Treatment for Diphtheria
Injection of _______
Antiserum to Toxin
Viral infection of Upper Respitory system
____ is the most frequent infections disease in humans
Common Cold
Which virus causes the common cold
Rhinovirus
The rhinovirus infects epithelial cells of the _______
Causing this action of the body’s innate immune system to stop ____
Upper respitory tract
Ciliary motion
The rhinovirus aka common cold what is the only source of this infection
Humans
______ upper respiratory tract infections
Characterized by FEVER
Lymph nodes of neck become swollen
Adenovirus
Pathogenesis of this species includes
Avoids host defense by delaying apoptosis, blocking interferion, interfer with antigen presenting
Following replication, “death protein” causes host cell lysis
Adenovirus
In pneumonia ___ containing pus and blood comes up from the lungs
Sputum
White shadows on chest X rays: Fluid in lungs is a symptom of this disease
Pneumonia
Pathogensis
Often caused by mucocilary elevator is compromised
Causative agent often has CAPSULE that DELAYS PHAGOCYTOSIS
Damaging effects are often due to inflammatory response
Name this Viral Infection
Pneumonia
Pneumonia can be bacterial, viral, fungal
True or false
True
Streptococcus pneumoniae is the Causative agent for this Bacterial pneumonia
Pneumococcal pneumonia
Gram-positive diplococcus know as pneumonococcus
Thick polysaccharides capsule responsible for virulence
Describes the causative agent for this disease
Pneumococcal penumonia
Capsule and (surface protein) PspA interfere with C3b of complement system Blocking phagocytes
Pneumococcal pneumonia
Enterobacteria such as _____ species and other gram-negative rods can cause pneumonia
Klebsiella pneumonia
This pneumonia is common in children and young adults.
Called walking pneumonia
Bacterial
Mycoplasmal pneumonia
Small bacterium lacking cell wall
Slow aerobic growth
Colonies look like fried eggs
Describes the causative agent for this
Bacterial infection AKA walking pneumonia
Mycoplasmal pneumonia
The epidemiology of this bacterial pneumonia is typically very young or very old / people with compromised immune systems ie. Hospitalized paitents
Klebsiella pneumonia
This pneumonia accounts for 1/5 of bacterial pneumonia
Mycoplasmal pneumonia
M. pneumonias illness length will be shorter if given
Macrolides
Pathogenesis of pneumonia
Inhalation of encapsulated pneumonococcus
Inhalation of colonized mucus droplets
Inhalation of infected droplets
Pneumococcal
Klebsiella
Mycoplasma
Epidemiology of pneumonia
Risk increases from compromised immune system
Common causes of health care associated pneumonia
Mild infections common
Pneumococcal
Klebsiella
Mycoplasmal
Pertussis is aka
Whooping cough
Bordella pertussis is the causative agent of…
Whooping cough
With pertussis the paitent is most infectious during the
Catarrhal stage
How is whooping cough preventable
Vaccine
DTaP
Diphtheria, tetanus, pertussis
Signs and symptoms of this disease include 3 stages
Catarrhal: runny rose fever
Paroxymial: violent coughing
Convalescence
Pertussis - Whooping Cough
Pathogenesis
Colonize lower respitory tract
Cilary action slowed
Toxins released cause death of epithelial cells & increased cAMP
Rise in lymphocytes
Pertussis: whooping cough
TB
Can be a latent infection first and may later become active
True or false
True
Slender acid fast rod shapped bacteria
Strict aerobic generation time 16 hr
Describe this causative agent
Mycobacterium tuberculosis
Pathogenesis of this disease includes
Alveolar macrophages eating them
Due to Mycolic acids they prevent fusion of the phagosome and lysosome
Pro-inflammatory response calls more macrophages
Form a granuloma called a “tubercles”
TB