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First Aid for the USMLE Step 1 (2023) | Medicine (MD/DO) School Study Aid
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
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
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
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
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
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 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
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
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
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
Norovirus
- Characteristics
- Calicivirus
- RNA Virus
- Non-enveloped
- Icosahedral
- SS Positive Linear
- Symptoms
- Acute Gastroenteritis
- Treatment
- Supportive Therapy
- Considerations
- Often found in Cruise Ships
1 min
Common Causes of Pneumonia: Neonates (< 4 Weeks Old)
- Group B Streptococci
- E. coli
44 secs
Common Causes of Pneumonia: Children (4 Weeks - 18 Years)
- Runts May Cough Chunky Sputum
- RSV (Viruses)
- Mycoplasma
- Chlamydia pneumoniae
- Chlamydia trachomatis
- Streptococcus pneumoniae
1 min
Common Causes of Pneumonia: Adults (18 - 40 Years Old)
- Mycoplasma
- Streptococcus pneumoniae
- Chlamydia pneumoniae
41 secs
Common Causes of Pneumonia: Middle-Aged Adults (40 - 65 Years Old)
- Streptococcus pneumoniae
- Mycoplasma
- Haemophilus influenzae
- Anaerobes
- Viruses
1 min
Common Causes of Pneumonia: Elderly (65+ Years Old)
- Influenza Virus
- Haemophilus influenzae
- Anaerobes
- Streptococcus pneumoniae
- Gram-Negative Rods
59 secs
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