Bacteria Flashcards
Catarrhal phase time and symptoms of B. pertussis
1-2 wks
Rhinorrhea, malaise, sneezing, anorexia
Paroxysmal phase time and symptoms of B. pertussis
2-4 wks
Repetitive cough with whoops, vomiting, leukocytosis
Convalescent phase time and symptoms of B. pertussis
3-4 wks
Diminished paroxysmal cough, development of secondary complication (pneumonia, seizure, encephalopathy)
Incubation phase time and symptoms of B. pertussis
7-10 days
No symptoms
Pharyngitis due to S. pyogenes symptoms
- Abrupt onset of Sore throat, fever, malaise, and headache
- Tonsillar abscesses
- Tender Anterior Cervical LN
Oligate anaerobes organisms
- Actinomyces
- Bacteroides
- Clostridum
Action of B. pertussis toxins
- Adenylate cyclase toxin: impairs leukocyte chemotaxis causes local edema
- Tracheal cytotoxin: interferes with ciliary action, kills ciliated cells
- Pertussis toxin: ADP riboxylation of Gi
Rickettsia features
Aerobic, gram- bacilli that are too small to stain
Obligate intracellular (do not make enough ATP)
S. agalactiae treatment
Amilcillin with AG or Cephalosporin
Otitis media and sinusitis due to S. pneumoniae treatment
Amoxicillin, erythromycin
Clostridium perfringens distinguishing features
- Anaerobic: Stormy fermentation in milk media
- Double zone of hemolysis
Actinomyces israelii distinguishing features
Anaerobic
Branching rods
Non-acid fast
Pasteurella multocida transmission
Animal bite
Mycoplasma pathogenesis
- Attaches to Resp epithelium via P1 protein
- Inhibits ciliary action
- Produces hydrogen peroxide, superoxide radicals and cytolytic enzymes that damage resp epith
- Acts as a Superantigen
mycobacterium tuberculosis distinguishing features
- Auramine-rhodamine staining bacilli (fluorescent apple green)
- Acid fast
- Aerobic
- Produces Niacin
- Produces a heat-sensitive catalase
H. ducreyi treatment
Azithromycin
Ceftriaxone
Ciprofloxacin
Endospores are found in
Bacillus
Clostridium
Stage 3 lyme disease
- Bell palsy
- Headache
- meningitis
- conjunctivitis
- palpitations
- arrhythmias
- myocarditis
- pericarditis
- Arthritis
Lyme disease caused by
Borrelia burgdorferi
What causes dirty gray pseudomembrane on oropharynx?
C. diphtheriae
Toxins that Increase cAMP
C: Cholera
A: Anthrax
Σ: E. coli
P: Pertussis
Microaerophilic organisms
- Campylobacter
- Helicobacter
Biggest contrast between N. meningitidis and N. gonorrhoeae
- Capsule
- Respiratory port of entry
- Maltose fermentation
S. pneumoniae pathogenesis
- Capsule: virulence factor
- IgA protease
- Teichoic acid
- Pneumolysin O: hemolysin/cytolysin
Pathogenesis of E. coli causing neonatl septicemia/meningitis
Casule- K1 serotype
S. saprophyticus chx
- Catalase +
- γ-Hemolysis
- Novobiocin R
S. epidermidis chx
- Catalase +
- γ-Hemolysis
- Novobiocin S
All strep are
Catalase and Coagulase negative
Walking pneumonia
Caused by Mycoplasma
Pharyngitis
May develop into atypical pneumonia with persistent hack
Rocky Mountain Spotted Fever
- Caused by Rickettsia rickettsii
- Hadache, fever
- Rash that starts on ankles and writs and then spreads to trunk, palms, soles and face
- Ankle and wrist swelling
Typhoid fever
- Caused by Salmonella typhi
- Infection begins in ileocecal region
- Travel via mesenteric LN and blood
- Replicates in macrophage
- If untreated causes necrosis of Peyer patches
Bubonic plague
- Caused by Yersinia pestis
- Rapidly increasing fever
- Regional buboes
- Conjunctivitis
Listeria and renal transplant
Causes adult Meningitis
H. influenzae treatment
Cefotaxime or ceftriaxone
Adult meningitis due to S. pneumoniae treatment
Ceftriaxone or Cefotaxime
Legionella grows on what medium?
Charcoal-yeast extract (S)
Neisseria (from normal sterile sites) and Haemophilus grow on what medium?
Chocolage agar
Thayer-Martin medium is
Chocolate agar with Vacno, Nystatin and colistin to inhibit the normal flora
Mycoplasma needs what to grow?
- Cholesterol
- Purines
- Pyrimidines
Bacillus anthracis treatment
Ciprofloxacin or doxycycline
Transmission of Mycoplasma
Close contact respiratory
Yersinia enterocolitica special feature
Cold growth
S. pneumoniae disease presentations
- Community acquired pneumonia
- Adult meningitis
- Otitis media and Sinusitis in children
S. aureus contaminated foods
Custard pastries
Potato salad
Canned meat
Primary stage of Syphilis (Treponema pallidum) DX:
Dark-field or fluorescent micro
How do you Dx. Legionella
Direct fluorescent antibody on biopsy and Dieterle silver stain
Elek test
Document C. diphtheriae toxin production
Toxin producing strains diffuse away from growth
Granulomatosis infantisepticum
Early-onset of neonatal listeria infection
Disseminated granulomas with central necrosis
Organisms associated with animal bites
- Eikenella corrodens: human causing Cellulitis
- Capnocytophaga canimorsus: Dog causing Cellulitis
- Bartonella henselae: Cats and dogs causing Cat Scratch Fever
Pathogenesis of Treponema pallidum
enarteritis resulting in lesions
Enteric bacteria grow on what medium?
- Eosin mthylene blue (D)
- MacConkeys (D)
TB pathogenesis
- Facultative intracellular
- Sulfatides: inhibit phagosome-lysosome fusion
- Cord factor: causes serpentine growth inhibiting leukocyte migration
- Tuberculin: delayed HS and CMI: Granulomas
Stage 2 Lyme disease
- Fatigue
- Chills and fever
- Headache
- Muscle and joint pain
- Swollen LN
- Secondary annular skin lesion
Campylobacter jejuni transmission
Fecal-oral
PRIMARILY from Poultry
How does B. pertussis attach to nasopharyngeal ciliated epithelial cells
- Filamentous hemagglutinin
- Pertussis toxin
Teichoic acid chx
- Found in G + only
- Chemical of Cell wall
- Immunogenic, induces TNF-α and IL-1
- Used for Attachment
What needs cysteine to grow?
- Francisella
- Brucella
- Legionella
- Pasteurella
Bacillus cereus transmission
Fried rice
Confirm nontreponemal Ab screening test with
FTA-ABS
Outer membrane found in
G - only
Outer membrane found in
G - only
S. aureus chx
- G+ Cocci
- Catalase +
- Coagulase +
- β Hemolysis
- Ferments Mannitol
- Salt tolerant
Periplasmic splace chx
G- only
Storage space housing β-lactamases
Diseases caused by C. perfreingens
Gas gangrene
Food poisoning
Campylobacter jejuni disease
Gastroenteritis:
- Blood and puss in diarrhea
- Can lead to Guillain-Barre syndrome and Reactive Arthritis
Pseduomonas in burn patients
GI colonization => skin => colonization of eschar => cellulitis (blue green pus) => septicemia
H. pylori Dx:
Giemsa or Silver stain
Listeria chx
- Gram + Rod
- Aerobic growth
- Exotoxin +
- Facultative intracellular
- Immuno Compromised hosts
Corynebacterium chx
- Gram + Rod
- Aerobic growth
- Exotoxin +
Bacillus chx
- Gram + Rod
- Sopre +
- Aeorbic Growth
- Exotoxin +
Clostridium chx
- Gram + rod
- Spore +
- Exotoxin +
Vibrio cholerae features
- Gram- curved rod with polar flagella
- Oxidase +
- Growth on Alkaline
- Shooting star motility
Haemophilus influenzae features
Gram- pleomorphic rod
Requres factors X and V to growh
Yersinia pestis features
Gram- rod with bipolar staining
Facultative intracellular
Coagulase +
Klebsiella pneumoniae features
Gram- rod
Capsule
Lactose fermenting
Proteus features
Gram- rod
Flagella/highly motile
Non-lactose fermenting
Urease positive
Shigella features
Gram- rod
Non-lactose fermenter
Salmonella features
Gram- rod
Non-lactose fermenter
Motile
Pseudomonas general freatures
Gram- rods
Oxidase positive
Aerobic
Bordetella pertussis features
Gram- rods
Strict Aerobes
Encapsulated
Francisella tularensis features
- Gram- small rod
- Facultative intracellular
- Found in many wild animals: rabbits, deer, and rodents
H. pylori features
- Gram- spiral bacilli with Flagella
- Microaerophilic: growis at 37.0oC
- Oxidase positive
- Urase positive
General features of Neisseria
Gram-
Diplococci with flattened sides
Oxidase postive
Corynebacterium diphtheriae distinguishing features
Gray-to-black colonies of club-shaped gram+ rods
S. pyogenes chx
- Group A Strep
- β-Hemolysis
- Bacitracin S
- M protein
- PYR positive
S. agalactiae chx
- Group B Strep
- β-Hemolysis
- Bacitracin R
- CAMP +
Tertiary stage of Syphilis (Treponema pallidum) clinical
- Gummas
- Aortitis
- CNS inflammation
Enteric pathogens grow on what medium?
- Hektoen enteric agar (D)
- Xylos-lysine-deoxycholate agar
Pseudomonas in adults causes
- Hot tub folliculitis
- Eye ulcers
- Transient GI colonization: loose stools
Haemophilus ducreyi reservoir
Human genitals
Pathogenesis of S. pyogenes
- Hyaluronic acid: non-immunogenic
- M-Protein: Antiphagocytic, Associated with acute glomerulonephritis
Toxic Shock Syndrome clinical symptoms
Hypotension
Scarlatiniform rash that desquamates on pams and soles
4 phases of B. pertussis
- Incubation
- Catarrhal
- Paroxysmal
- Convalescent
Chlamydia pathogenesis
Infection of nonciliated columnar or cuboidal epithelial cells of mucosal surfaces leads to granulomatous response and damage
S. aureus disease presentations
- Infective endocarditis
- Abscesses
- TSS
- Gastroenteritis (toxin A)
- Lesions, Pyoderma, Impetigo
- Osteomyelitis
Rickettsia rickettsii pathogenesis
Invade endothelial cells lining capillaries causing vasculitis in many organs including brain, liver, skin, lungs, kidney, and GI
Shigella pathogenesis
Invade M cells, replicates, and polymerize actin jet trails to go LATERALLY to other cells. Causeing shallow ulcers
Borrelia burgdorferi pathogenesis
Invades skin and spreads via the bloodstream to involve primarly the heart, joints, and CNS
Alpha toxin of C. perfringens action
- Is a lecithinase
- Disrupts membranes
- Damages RBC, Platelets, WBC and Endothelial cells
CEEK
Lactose fermenters
Citrobacter
Enterobacter
E. Coli
Klebsiella
Borrelia burgdorferi features
Large spirochetes
Gram-
Found in white-footed mice and white-tailed deer
What form of M. leprae will you have a high # of organisms
Lepromatous (foam cells totally filled)
Vibrio cholerae grows on what medium
Likes Alkaline growth medium
TCBS (Thiosulfate Citrate Bile salts Sucrose agar) (S)
Listeria pathogenesis
Listeriolysin O: rapid egress from phagogosome into cytoplasm
What is the primary target of Pseduomonas
Liver
Corynebacterium grows on what agar?
- Löffler’s coagulated serum (S)
- Tellurite agar (D)
Mycobacterium grows on what medium?
Löwenstein-Jensen medium (S)
Outer membrane composition
- LPS: Endotoxin
- Lipid A: Toxic
- Polysaccharide: Immunogenic
Bacterial pneumonia due to S. pneumoniae treatment
macrolides
Secondary stage of Syphilis (Treponema pallidum) clinical
- Maculopapular (copper-colored) rash includes palms and soles
- Patchy alopecia
- Condyloma lata
Cardiolipin found in
Mammalian mitochondrial membrane and in treponemes
CSF profile with pt with S. pneumoniae meningitis
- Many PMN
- Decrease Glucose
- Increase protein
Disease caused by H. influenzae
- Meningitis
- Otitis media
- Bronchitis
- Pneumonia
- Epiglottitis
Mycoplasma pneumoniae features
Missing peptidoglycan (NO CELL WALL)
Sterols in membrane
“Fried-egg” colonies on Eaton’s media
Oligate aerobe organisms
- Mycobacterium
- Pseudomonas
- Bacillus
S. aureus treatment
Nafcillin/oxacillin DOC
MRSA: Vanco
VRSA: -Pristin
Three activities of Shag toxin
Neurotoxic
Cytotoxic
Enterotoxic
ShYPS
Non-lactose fermenters
Shigella (Nonmotile)
Yersina (Nonmotile)
Proteus (Motile)
Salmonella (Motile)
Primary stage of Syphilis (Treponema pallidum) clinical
nontender chancre
Actinomyces israelii reservoir
Normal flora of gingival crevices and female genital tract
Enterobacteriaceae Antigens
- O: cell envelope
- H: Flagellar antigen
- K: capsular polysaccharide antigen
- Vi (virulence): Salmonella capsular antigen
Chlamydia trachomatis features
- Obligate intracellular
- Has Elementary (infective) and reticulate (metabolically active) body
- Cannot make own ATP
- Cell wall lacks muramic acid
Community acquired pneumonia due to Klebsiella found with
Older males
Pts of either Chronic lung disease, alcoholism, or diabetes
Non typhi Salmonella and sickle cell
Osteomyelitis
Pneumolysin O
- Pathogenesis of S. pneumoniae
- Damages respiratory epithelium
- Inhibits leukocyte repiratory burst and inhibits classical complement fixation
Gardnerella Dx:
pH>4.5
Clue cells (epithelial cells covered with bacteria)
Scarlet fever due to S. pyogenes symptoms
- Pharangitis
- Sandpaper rash (palms and soles spared)
- Circumolar pallor
- Strawberry tongue
- Nausea/vomiting
S. pyogenes disease presentation
- Pharyngitis
- Scarlet fever
- Pyoderma/impetigo
- Suppurative Lesions
- Rheumatic fever
- Acute glomerulonephritis
S. pyogenes disease presentation
- Pharyngitis
- Scarlet fever
- Pyoderma/impetigo
- Suppurative Lesions
- Rheumatic fever
- Acute glomerulonephritis
N. gonorrhoeae pathogenesis
- Pili: attachment, inhibits phagocytic uptake and has over 1 million variants
- Outer Membrane Proteins: IgA protease
Pneumonia caused by S. aureus clinical symptoms
- Productive with rapid onset
- High rate of necrosis
- High fatality
- Salmon-colored sputum
C. diphtheriae diseases
- Pseduomembrane on throat
- Bull neck
- Myocarditits
- Cardiac dysfunciton
- Reccurent laryngeal nerve palsy
What is used to Dx B. pertussis
Regan-Lowe or Bordet-Gengou
Microaerophilic chx
Require low but not full oxygen tension
Obligate aerobes chx
- Require Oxygen
- No fermentative pathways
- Generally produce superoxide dismutase
Cholera symptoms
Rice water stool
Tremendous fluid loss
Hypovolemic shock
N. meningitidis prophylaxis
Rifampin
Tuberculoid CMI
Srong CMI: Th1
Congenital Syphilis (Treponema pallidum) clinical
- Stillbirth
- Keratitis
- 8th nerve damage
- notched teeth
- widespread desquamating maculopapular rash
Stage 1 lyme disease
Target rash
Neisseria from site with normal flora grows on what medium?
Thayer-Martin selective medium (S)
Treponema pallidum features
Thin spirochete
Outer membrane has endotoxin-like lipds
Anaerobes grow on what medium
Thioglycolate
Transmission of Francisella tularensis
Tick bite: ulceroglandular disease
Traumatic implantation: while skinning rabbits
C. difficile pathogenesis
- Toxin A: enterotoxin damaging mucosa leading to fluid increase and granulocyte attractant
- Toxin B: cytotoxin: Cytopathic
Which form of M. leprae will you have lepromin skin test +
Tuberculoid
PITcH
Types of E. coli
Pediatric: EPEC
Inflammatory: EIEC
Traveler: ETEC
coli
Hamburger: EHEC
Listeria reservoir
Unpasteruized milk products
Cold Growth
How does Proteus cause kidney stones
Urease raises urine pH
Nagler reaction
Used to identifiy C. perfringens
Egg yolk agar
One side has Anti-α-toxin
Gardnerella symptoms
Vaginal odor, increase discharge (thin, gray fluid)
Increase with increase vaginal pH
Examples of nontreponemal Ab screening test
Veneral disease research lab (VDRL)
Rapid plasma reagin (RPR)
Automated reagin test (ART)
Recombinant antigen test (ICE)
Pseduomonas reservoir
Water
Lepromatous CMI
Weak CMI: Th2
Legionella general features
- Weak Gram- pleomorphic rod requiring cysteine and iron
- Water organism
- Facultative intracellular
Haemophilus needs what to grow?
- X (protoporphyrin)
- V (NAD)
Viridans chx
- α-Hemolytic
- Optochin R
S. pneumoniae chx
- α-Hemolytic
- Optochin S
- Lysed by bile