Gastroenteritis
- Viruses
 - Bacteria
 - Food Intolerances
 - Flu-Like Symptoms
 - GI Distress
 - Bloody Stool
 - Oral Rehydration
 - Self-Limiting
 - Prevention
 
Salmonella Typhi
- Colonizes Gallbladder
 - Monocytic Immune Response
 - Typhoid Fever
 - Abdominal Pain
 - Rose Spots on Abdomen
 - Constipation Followed by Diarrhea
 - Ceftriaxone
 - Fluoroquinolones
 - Oral Vaccine - Live
 - IM Vaccine - Capsular Polysaccharide
 
Clostridioides difficile (Clostridium difficile)
- Gram-Positive
 - Bacillus
 - Anaerobe
 - Clindamycin and Ampicillin
 - Toxin A Enterotoxin
 - Damages Brush Border of Gut
 - Toxin B Cytotoxin
 - Damages Cytoskeletal Structure
 - Diarrhea
 - Pseudomembranous Colitis
 - Toxic Megacolon
 - Detect Toxins in Stool
 - Metronidazole
 - Vancomycin
 
Clostridioides difficile (Clostridium difficile) Treatments
- Oral Vancomycin
 - Fidaxomicin
 - Metronidazole
 - Stool Transplant
 
E. coli Overview
- Gram-Negative
 - Bacillus
 - Purple Colony with Metallic Green Sheen
 - Lactose-Fermenting
 - Pink on MacConkey Agar
 - Diarrhea
 - Lipid A Septic Shock
 - P Pili Pyelonephritis and Cystitis
 - K Capsule Neonatal Meningitis
 - K Capsule Pneumonia
 - H Antigen Flagella
 
Enterohemorrhagic E. Coli (EHEC)
- O157:H7
 - Non-Sorbitol Fermenting
 - Hamburger Meat
 - Produces Shiga-like Toxin
 - Gram-negative 
 - Lysogeny
 - Inactivates 60S Ribosome
 - Bloody Diarrhea
 - Hemolytic Uremic Syndrome (HUS)
 - Hemolytic Anemia
 - Acute Renal Failure
 - Thrombocytopenia
 
Shigella
- Gram-Negative
 - Bacilli
 - Non Lactose Fermenting
 - White on Macconkey Agar
 - Oxidase Negative
 - Non H2S Producing
 - Day Care Centers
 - High Virulence
 - Replicates Intracellularly
 - Actin Rocket
 - Bloody Diarrhea
 - Shiga Toxin
 - Inhibits 60S Ribosome
 - Hemolytic Uremic Syndrome (HUS)
 - Hemolytic Anemia
 - Thrombocytopenia
 - Kidney Failure
 
Listeria Monocytogenes Characteristics
- Gram Positive
 - Bacillus
 - Intracellular
 - Survives in Cold Temperature
 - Actin Rocket
 - Tumbling Motility
 - Catalase-Positive
 - Beta-Hemolytic
 - Only Gram-Positive with Endotoxin-Like Structure
 
Listeria Monocytogenes Disease
- Soft Cheese
 - Pregnant Women Have Flu-Like Symptoms
 - Pregnant Women Have GI Symptoms
 - Granulomatosis Infantiseptica
 - Spontaneous Abortion
 - Meningitis
 - Monocytes in CSF
 - Ampicillin
 
Norovirus
- Calicivirus
 - RNA Virus
 - Non-enveloped
 - Icosahedral
 - SS Positive Linear
 - Acute Gastroenteritis
 - Supportive Therapy
 - Often found in Cruise Ships
 
Rotavirus
- Reovirus
 - Non-enveloped
 - Double-Stranded
 - RNA Virus
 - Linear
 - 11 Segments
 - Triple Icosahedral Capsid
 - Most Common Cause of Diarrhea Worldwide
 - Villous Atrophy
 - Winter Months
 - Day Care Centers
 - Oral Rehydration
 
Hepatitis A
- Picornavirus
 - 4 Week Incubation Period
 - Fecal-oral
 - Day Care Centers
 - Travel to Developing Countries
 - Usually Asymptomatic
 - Acute Disease
 - Jaundice
 - Fever
 - Vomiting
 
Hepatitis A (HAV) Assessment
- Fecal-Oral
 - Ingestion of Contaminated Food or Water
 - 4 Weeks
 - Fever
 - General Malaise
 - Hepatomegaly
 - Self-Limiting
 - Proper Hand Washing
 
Hepatitis B Virus Disease
- Can turn chronic
 - < 10% of adults become chronic carriers
 - 90% of newborns become chronic carriers
 - Cirrhosis
 - Hepatocellular carcinoma
 - Membranous Glomerulonephritis
 - Polyarteritis nodosa
 - Serum sickness like syndrome
 
Hepatitis B (HBV) Assessment
- Bodily Fluids
 - Blood Transmission
 - People Who Use IV Drugs
 - Variable 1-6 Months
 - Fever
 - Nausea and Vomiting
 - Hepatomegaly
 - Cirrhosis
 - Hepatocellular Carcinoma
 - Vaccination
 
Hepatitis B Virus Characteristics
- Hepadnavirus
 - Enveloped
 - Circular
 - Partially Double-stranded DNA
 - Has Reverse Transcriptase
 - IV Drug Use
 - Sex
 - Maternal Fetal Routes
 - 3 Month Incubation Period
 
Hepatitis C
- Enveloped
 - RNA Virus
 - Flavivirus
 - Icosahedral
 - SS positive Linear
 - Most Cases are Due to IV Drug Use
 - Turns to Chronic Hepatitis in Over 70% of Cases
 - Cirrhosis
 - Hepatocellular Carcinoma
 - Most Common Indication for Liver Transplantation
 - Associated With Type I MPGN
 - Porphyria Cutanea Tarda
 
Hepatitis C (HCV) Assessment
- Blood Transmission
 - High Risk Sex 
 - People Who Use IV Drugs
 - 7 Weeks
 - Cirrhosis
 - Barrier Protection
 
Clostridium botulinum
- Bacillus
 - Gram-positive
 - Anaerobe
 - Spore-forming
 - Heat Labile Toxin
 - Inhibits Acetylcholine (Ach) Release at Neuromuscular Junction (NMJ)
 - Canned Food in Adults
 - Spores in Honey
 - Descending Flaccid Paralysis
 - Diplopia
 - Ptosis
 - Floppy Baby
 - Constipation
 
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
 
Bacillus Cereus Characteristics
- Gram-Positive
 - Bacilli
 - Endospore Forming
 - B Hemolytic
 - Toxins and Enterotoxins
 - Reheated Rice
 
Bacillus Cereus Disease
- Emetic Form
 - Short Incubation (1-6 Hours)
 - Nausea and Vomiting
 - Diarrheal Form
 - Long Incubation (8-16 Hours)
 - Diarrhea and GI Pain
 
Entamoeba histolytica
- Protozoa
 - Amebiasis
 - Ingestion of Cysts in Food and Water
 - Bloody Diarrhea
 - Flask-Shaped Ulcer
 - Liver Abscess
 - Anchovy Paste
 - RUQ Pain
 - RBCs in Cytoplasm of Trophozoite
 - Cyst With Four Nuclei
 - Metronidazole
 - Iodoquinol
 
Giardia lamblia
- Protozoa
 - Ingestion of Cysts
 - Seen in Campers
 - Daycare Centers
 - Mental Hospitals
 - Infects Small Intestine
 - Bloating
 - Flatulence
 - Fatty Diarrhea
 - Crescent-shaped Protozoa Adjacent to Epithelial Brush Border
 - Predisposed if Low IgA
 - Metronidazole
 
Echinococcus Granulosus
- Cestode (Tapeworm)
 - Ingestion of Eggs from Dog Feces
 - Hydatid Cysts in Liver
 - Fibrosis and Necrosis
 - Anaphylaxis if Antigens Released
 - Albendazole
 - Surgical Removal
 
Trypanosoma cruzi
- Protozoa
 - Triatomine Bug
 - Kissing bug
 - Painless bite
 - Predominantly in South America
 - Chagas disease
 - Romana's sign
 - Dilated Cardiomyopathy
 - Megacolon
 - Megaesophagus
 - Blood smear
 - Nifurtimox
 - Benznidazole