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GI Bugs
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
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
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
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
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
Cryptosporidium
Characteristics
Protozoa
Ingestion of Oocysts in Food or Water
Acid Fast Cysts
Signs and Symptoms
Outbreaks of Diarrhea from Contaminated Water Supply
Mild Disease in Non-immunocompromised
Severe Diarrhea in AIDS
Treatment
Nitazoxanide for Immunocompetent
2 mins
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
Entamoeba histolytica
Pathophysiology
Protozoa
Amebiasis
Ingestion of Cysts in Food and Water
Signs and Symptoms
Bloody Diarrhea
Flask-Shaped Ulcer
Liver Abscess
Anchovy Paste
RUQ Pain
Diagnosis
RBCs in Cytoplasm of Trophozoite
Cyst With Four Nuclei
Treatment
Metronidazole
Iodoquinol
3 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
Giardia lamblia
Characteristics
Protozoa
Ingestion of Cysts
Seen in Campers
Daycare Centers
Mental Hospitals
Infects Small Intestine
Signs and Symptoms
Bloating
Flatulence
Fatty Diarrhea
Diagnosis
Crescent-shaped Protozoa Adjacent to Epithelial Brush Border
Predisposed if Low IgA
Treatment
Metronidazole
3 mins
Helicobacter Pylori
Characteristics
Gram-Negative
Bacilli
Curved
Polar Flagellum
Catalase-Positive
Oxidase-Positive
Disease
Gastric and Duodenal Ulcers
Ammonia
Neutral Environment
Gastric Adenocarcinoma
MALT lymphoma
Diagnosis
Serology IgG antibody
Stool Antigen
Urease Positive Breath Test
Biopsy
Treatment
2 ABX and PPI
2 mins
Helicobacter pylori Associations
Gastritis
Peptic Ulcer Disease
Stomach Cancer
50 secs
Pinworm (Enterobius Vermicularis)
Pathophysiology
Nematode (Roundworm)
Ingestion of Eggs
Intestinal Infection
Anal Pruritus
Diagnosis
Scotch Tape Test
Treatment
Albendazole
Pyrantel Pamoate
2 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
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
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