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First Aid for the USMLE Step 1 (2023) | Medicine (MD/DO) School Study Aid
Mycobacterium leprae
- Characteristics
- Acid-Fast
- Aerobic
- Likes Cool Temperature
- Diagnosis by Skin Biopsy or PCR
- Lepromatous Leprosy
- Th2 Response
- Leonine Facies
- Tuberculoid Leprosy
- TH1 Response
- Hypoesthetic Skin Plaques
- Granulomatous Response
- Treatment
- Dapsone
- Rifampin
- Clofazimine
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
2 mins
Moraxella catarrhalis
- Characteristics
- Gram-Negative
- Diplococci
- Oxidase-positive
- Catalase-positive
- Associated Infections
- Otitis Media
- Sinusitis
- Chronic Obstructive Pulmonary Disease (COPD)
- Bronchitis
- Laryngitis
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
5 mins
Haemophilus influenzae Characteristics
- Characteristics
- Gram-Negative
- Coccobacilli
- PRP Capsule in Type B
- Positive Quellung Reaction
- IgA Protease
- Chocolate Agar
- Factor V is NAD
- Factor X is Hematin
- Staph Aureus Provides Factor V
2 mins
Bordetella pertussis
- Pathophysiology
- Gram-Negative
- Coccobacillus
- Bordet-Gengou Agar
- ADP Ribosylating AB Toxin
- Inhibits Gi to cause Increase in cAMP
- Signs AND Symptoms
- Lymphocytosis
- Increase in Insulin
- Catarrhal Phase is Infectious Period
- Paroxysmal Phase is Symptomatic Period
- Whooping Cough
- Treatment
- Macrolides
4 mins
Pasteurella multocida
- Bacteria Characteristics
- Gram-Negative
- Coccobacilli
- Charcoal Yeast with Iron and Cysteine
- Zoonotic - Cats and Dogs
- Signs & Symptoms
- Cellulitis
- Osteomyelitis
- Septic Arthritis
- Treatment
- Amoxicillin-clavulanate
- Intravenous Antibiotics for Invasive Disease
2 mins
Brucella
- Characteristics
- Gram-Negative
- Coccobacillus
- Unpasteurized milk
- Goat cheese
- Inside macrophages
- Signs and Symptoms
- Lymphadenopathy
- Granulomas
- Undulating fever
- Treatment
- Doxycycline
- Gentamicin
2 mins
Francisella tularensis
- Mechanism
- Contact with Infected Animals
- Dermacentor Wood Tick
- Deer Fly
- Characteristics
- Gram-Negative
- Coccobacilli
- Facultative Intracellular
- Charcoal Yeast Agar with Cysteine and Iron
- Signs and Symptoms
- Ulceration
- Fever
- Painful Lymphadenopathy
- Caseating Granulomas
- Treatment
- Streptomycin
3 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
Vibrio Cholera Characteristics
- Gram-Negative
- Bacilli
- Glucose Fermenting
- Non-lactose Fermenting
- Oxidase Positive
- Comma Shaped
- Thrives in Alkaline Environment
- Crustaceans
1 min
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
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
Yersinia Pestis (Black Plague)
- Characteristics
- Gram-Negative
- Bacilli
- Oxidase-Negative
- Non-lactose Fermenting
- Prairie Dogs
- Fleas
- Polysaccharide Capsule
- Vw Antigen
- F1 Antigen
- Inhibits Macrophages
- Southwest Region
- Signs and Symptoms
- Lymphadenopathy
- Pneumonia
- Black Cutaneous Hemorrhagic Lesions
- Buboes
- Diagnosis
- Bipolar Giemsa Staining
3 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
Proteus Mirabilis
- Characteristics
- Gram-Negative
- Bacillus
- Oxidase Negative
- Urease-Positive
- Swarming Motility
- Non-lactose Fermenting
- Symptoms
- Urinary Tract Infection
- Struvite Crystals
- Staghorn Kidney Stones
2 mins
Pseudomonas Aeruginosa Characteristics
- Characteristics
- Gram-Negative
- Bacillus
- Aerobic
- Pyocyanin Pigment
- Blue-green Pigment
- Grape like odor
- Non-lactose Fermenting
- Polysaccharide Capsule
- Catalase-Positive
- Oxidase-Positive
- Inactivates Elongation Factor 2
- Exotoxin A
- Endotoxin
- Water sources
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
Klebsiella Disease
- Signs and Symptoms
- Aspiration Pneumonia
- Alcoholics
- Diabetics
- Red Currant Jelly Sputum
- Lung Abscess
- Nosocomial Urinary Tract Infection
2 mins
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