Alexandra Shared "STEP Microbiology" - 91 Picmonics

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STEP Microbiology

EHEC (Enterohemorrhagic E. Coli)
Characteristics
O157:H7
Non-Sorbitol Fermenting
Hamburger Meat
Produces Shiga-Like Toxin
Gram-Negative
Lysogeny
Inactivates 60 S ribosome
Disease
Bloody Diarrhea
Hemolytic Anemia
Hemolytic Uremic Syndrome (HUS)
Acute Renal Failure
Thrombocytopenia
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2 mins
Vibrio Cholera Disease
ADP ribosylating AB toxin
Turn Gs on causing increase in cAMP
Secretion of Cl
Blocks reabsorption of Na
Rice water diarrhea
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1 min
Staphylococcus aureus Characteristics
Characteristics
Gram-Positive
Cocci
Catalase-Positive
Coagulase-Positive
Beta-Hemolytic
Protein A Virulence Factor
Inhibits Phagocytosis
MRSA
Resistant to Beta Lactams Due to Altered Penicillin Binding Proteins (PBPs)
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2 mins
Staphylococcus epidermidis
Characteristics
Cocci
Gram-Positive
Catalase-Positive
Urease-Positive
Coagulase-Negative
Novobiocin-Sensitive
Component of Normal Skin Flora
Infects Prosthetic Devices and IV Catheters
Contaminates Blood Cultures
Produces Adherent Biofilms
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2 mins
Staphylococcus saprophyticus
Characteristics
Gram-Positive
Cocci
Catalase-Positive
Coagulase-Negative
Novobiocin-Resistant
Urease-Positive
Disease
Urinary Tract Infections (UTI's)
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1 min
Streptococcus Pneumoniae Characteristics
Characteristics
Gram-Positive
Diplococci
Lancet-Shaped
Catalase-Negative
Optochin-Sensitive
Bile Soluble
Alpha-Hemolytic
Polysaccharide Capsule
Positive Quellung Reaction
IgA Protease
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1 min
Streptococcus Pneumoniae Disease
Signs and Symptoms
Sickle Cell Anemia
Sepsis in Patients with Splenectomy
Rusty Sputum
MOPS
Meningitis
Otitis Media
Pneumonia
Sinusitis
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2 mins
Streptococcus viridans
Characteristics
Gram-Positive
Cocci
Catalase-Negative
Alpha-Hemolytic
Optochin-Resistant
Not Bile Soluble
Normal Flora of Oropharynx
Synthesize Dextrans from Sucrose
Disease
Dental Caries
Subacute Bacterial Endocarditis
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2 mins
Streptococcus pyogenes Characteristics
Characteristics
Group A Streptococci (GAS)
Gram-Positive
Cocci
Beta-Hemolytic
Catalase-Negative
Bacitracin-Sensitive
Hyaluronic Acid Capsule
Streptolysin O
DNase
Streptokinase
Exotoxin A
Pyrrolidonyl Arylamidase (PYR) Positive
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2 mins
Streptococcus agalactiae
Characteristics
Group B Streptococci
Gram-Positive
Cocci
Beta-Hemolytic
Bacitracin-Resistant
Catalase-Negative
Pyrrolidonyl Arylamidase (PYR) Negative
Polysaccharide Capsule
Hippurate Positive (+)
Produces CAMP Factor
Enlarges Area of Hemolysis by S. aureus
Disease
Mainly in Babies
Meningitis
Pneumonia
Sepsis
Colonizes Vagina
Treatment
Screen Pregnant Women at 35-37 Weeks
Penicillin
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3 mins
Enterococci
Characteristics
Gram-Positive Cocci
Catalase Negative
6.5% NaCl
Grows in Bile
Normal Colonic Flora
Signs and Symptoms
Urinary Tract Infection
Subacute Endocarditis
Penicillin Resistant
VRE (Vancomycin Resistant Enterococci)
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2 mins
Bacillus Anthracis (Anthrax) Characteristics
Characteristics
Gram-Positive
Spore-Forming
D-glutamate Polypeptide Capsule
Protective Antigen
Lethal Toxin
Edema Factor
Increased cAMP
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1 min
Bacillus Cereus Characteristics
Gram-Positive
Bacilli
Endospore Forming
B Hemolytic
Toxins and Enterotoxins
Reheated Rice
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1 min
Clostridium tetani
Characteristics
Gram-Positive
Bacilli
Obligate Anaerobic
Exotoxin
Spore-Forming
Renshaw Cells in the Spinal Cord
Blocks Glycine and GABA Release
Signs and Symptoms
Spasms
Risus Sardonicus
Lockjaw
Opisthotonus
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3 mins
Clostridium botulinum
Characteristics
Bacillus
Gram-Positive
Anaerobe
Spore-Forming
Heat Labile Toxin
Inhibits Acetylcholine (Ach) Release at Neuromuscular Junction (NMJ)
Canned Food in Adults
Spores in Honey
Signs and Symptoms
Descending Flaccid Paralysis
Diplopia
Ptosis
Floppy Baby
Constipation
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2 mins
Clostridium perfringens
Characteristics
Gram-Positive
Bacillus
Anaerobe
Spore-Forming
Alpha Toxin Lecithinase
Phospholipase
Heat Labile Enterotoxin
Signs and Symptoms
Myonecrosis
Gas Gangrene
Food Poisoning and Diarrhea
Treatment
Hyperbaric O2 Chamber
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2 mins
Corynebacterium diphtheriae
Characteristics
Gram-Positive
Bacillus
Exotoxin
ADP Ribosylation of Elongation Factor 2
Beta Prophage
Lysogeny
Tellurite Agar
Chinese Letters
Metachromatic Blue Red Granules
Aniline Stains Deeply Methylene Blue
Signs and Symptoms
Pseudomembranous Pharyngitis
Lymphadenopathy
Myocarditis
Polyneuritis
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3 mins
Listeria Monocytogenes Characteristics
Characteristics
Gram Positive
Bacillus
Intracellular
Survives in Cold Temperature
Actin Rocket
Tumbling Motility
Catalase-Positive
Beta-Hemolytic
Only Gram-Positive with Endotoxin-Like Structure
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2 mins
Neisseria gonorrhoeae Characteristics
Characteristics
Gram Negative
Diplococci
Chocolate Agar
Thayer-Martin Media
VPN
Oxidase Positive
Glucose Fermenting
Pilus
Opa Surface Protein
Rapid Antigenic Variation
IgA Protease
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2 mins
Neisseria Meningitidis
Characteristics
Gram-Negative
Diplococci
Chocolate Agar
Thayer-Martin Media
VPN
Oxidase-Positive
Maltose Fermentation
Glucose Fermentation
Endotoxin
Lipooligosaccharide (LOS) in Membrane
Polysaccharide Capsule
IgA Protease
Disease
Waterhouse Friderichsen Syndrome
Adrenal Insufficiency
Petechial Rash
Treatments
Ceftriaxone
Rifampin Prophylaxis
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5 mins

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