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S1 GI Week 2
E. coli Overview
Characteristics
Gram-Negative
Bacillus
Purple Colony with Metallic Green Sheen
Lactose-Fermenting
Pink on MacConkey Agar
Disease
Diarrhea
Lipid A Septic Shock
P Pili Pyelonephritis and Cystitis
K Capsule Neonatal Meningitis
K Capsule Pneumonia
H Antigen Flagella
2 mins
Enterohemorrhagic E. Coli (EHEC)
Characteristics
O157:H7
Non-Sorbitol Fermenting
Hamburger Meat
Produces Shiga-like Toxin
Gram-negative
Lysogeny
Inactivates 60S Ribosome
Disease
Bloody Diarrhea
Hemolytic Uremic Syndrome (HUS)
Hemolytic Anemia
Acute Renal Failure
Thrombocytopenia
2 mins
Salmonella Overview
Pathophysiology
Gram-Negative Rod
Oxidase Negative
Non Lactose Fermenter
White on Macconkey Agar
H2S Producing
Flagella
Invades GI Tract
Peyer's Patches
Considerations
Osteomyelitis in Sickle Cell Patients
Reactive Arthritis
Antibiotics Prolong Fecal Excretion
3 mins
Salmonella Enterica Spp.
Characteristics
Animal and Human Reservoir
Poultry and Eggs
Turtles
PMN Immune Response
Symptoms
Gastroenteritis
Diarrhea
Possibly Bloody
Treatments
No Antibiotics
No Vaccine Available
2 mins
Salmonella Typhi
Characteristics
Colonizes Gallbladder
Monocytic Immune Response
Symptoms
Typhoid Fever
Abdominal Pain
Rose Spots on Abdomen
Constipation Followed by Diarrhea
Treatments
Ceftriaxone
Fluoroquinolones
Considerations
Oral Vaccine - Live
IM Vaccine - Capsular Polysaccharide
2 mins
Campylobacter jejuni
Characteristics
Gram-Negative
Bacillus
Flagella
Curved
Corkscrew Appearance
Oxidase-Positive
Grows Well at 42 Degrees
Undercooked Meat
Unpasteurized Milk
Animals with Diarrhea
Signs and Symptoms
Bloody Diarrhea
Guillain-Barre syndrome
Reactive Arthritis
3 mins
Shigella
Characteristics
Gram-Negative
Bacilli
Non Lactose Fermenting
White on Macconkey Agar
Oxidase Negative
Non H2S Producing
Day Care Centers
High Virulence
Replicates Intracellularly
Actin Rocket
Signs and Symptoms
Bloody Diarrhea
Shiga Toxin
Inhibits 60S Ribosome
Hemolytic Uremic Syndrome (HUS)
Hemolytic Anemia
Thrombocytopenia
Kidney Failure
3 mins
Vibrio Cholera Characteristics
Gram-Negative
Bacilli
Glucose Fermenting
Non-lactose Fermenting
Oxidase Positive
Comma Shaped
Thrives in Alkaline Environment
Crustaceans
1 min
Vibrio Cholera Disease
ADP Ribosylating AB Toxin
Turn Gs on Causing Increase in cAMP
Secretion of Cl
Blocks Reabsorption of Na
Rice Water Diarrhea
1 min
Yersinia Enterocolitica
Characteristics
Gram-Negative
Bacilli
Non-lactose Fermenting
Non-H2S Producing
Oxidase-Negative
Day Care Centers
Pork
Raw Milk
Pet (Puppy) Feces
Signs and Symptoms
Bloody Diarrhea
Mesenteric Adenitis
Granulomatous Microabscess in Mesenteric Lymph Nodes
Pseudoappendicitis (Mimics)
Reactive Arthritis
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
2 mins
Clostridioides difficile (Clostridium difficile)
Characteristics
Gram-Positive
Bacillus
Anaerobe
Clindamycin and Ampicillin
Toxin A Enterotoxin
Damages Brush Border of Gut
Toxin B Cytotoxin
Damages Cytoskeletal Structure
Signs and Symptoms
Diarrhea
Pseudomembranous Colitis
Toxic Megacolon
Diagnosis
Detect Toxins in Stool
Treatment
Metronidazole
Vancomycin
3 mins
Clindamycin
Mechanism of Action
Bacteriostatic
Binds 50S Ribosomal Subunit
Blocks Translocation
Indications
Anaerobic Infections above the Diaphragm
Aspiration Pneumonia
Lung Abscess
Side Effects
Can Cause Pseudomembranous Colitis
1 min
Bacillus Cereus Characteristics
Gram-Positive
Bacilli
Endospore Forming
B Hemolytic
Toxins and Enterotoxins
Reheated Rice
1 min
Bacillus Cereus Disease
Signs and Symptoms
Emetic Form
Short Incubation (1-6 Hours)
Nausea and Vomiting
Diarrheal Form
Long Incubation (8-16 Hours)
Diarrhea and GI Pain
2 mins
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)
2 mins
Staphylococcus aureus Disease
Skin Infections
Impetigo
Abscesses
Exfoliative Toxin
Scalded Skin Syndrome
Toxic Shock Syndrome (TSST 1)
Binds to MHC II and T Cell Receptor
Food Poisoning
Acute Bacterial Endocarditis
Pneumonia
Osteomyelitis
2 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
2 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
2 mins
Listeria Monocytogenes Disease
Signs and Symptoms
Soft Cheese
Pregnant Women Have Flu-Like Symptoms
Pregnant Women Have GI Symptoms
Granulomatosis Infantiseptica
Spontaneous Abortion
Meningitis
Monocytes in CSF
Treatment
Ampicillin
2 mins
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