MSN 621 EXAM STUDY GUIDE 2026
COMPLETE QUESTIONS WITH ANSWERS
GUARANTEED TO PASS
▶ Traveler's diarrhea. Answer: -common pathogens= E.coli (most
common), Campylobacter, Shigella
-Treatment=oral rehydration, Loperamide (if no fever or blood), Antibiotic in
severe cases
▶ Diarrhea illness. Answer: Acute= less than 14 days
Chronic= more than 4 weeks
-inflammatory= fever, blood, mucus, tenesmus
- non- inflammatory= watery, large volume, no blood
-Diagnostics= stool studies if bloody diarrhea, fever, immunocompromised,
recent travel
-treatment= fluids first, antibiotics only when indicated, avoid anti-mobility
agents in inflammatory diarrhea
▶ Diagnostic principles for infectious disease (Lab). Answer: Lab test
RT-PCR= early viral detection
ELISA= antibody detection
Mantoux= TB screening
IGRA= TB, no false positives from BCG
*Always correlate with timing of illness, immune status and clinical
presentation
▶ Diagnostic principles for infectious diseases (imaging/ referral). Answer:
- CXR for suspected TB
-CT for severe abdominal infection
COMPLETE QUESTIONS WITH ANSWERS
GUARANTEED TO PASS
▶ Traveler's diarrhea. Answer: -common pathogens= E.coli (most
common), Campylobacter, Shigella
-Treatment=oral rehydration, Loperamide (if no fever or blood), Antibiotic in
severe cases
▶ Diarrhea illness. Answer: Acute= less than 14 days
Chronic= more than 4 weeks
-inflammatory= fever, blood, mucus, tenesmus
- non- inflammatory= watery, large volume, no blood
-Diagnostics= stool studies if bloody diarrhea, fever, immunocompromised,
recent travel
-treatment= fluids first, antibiotics only when indicated, avoid anti-mobility
agents in inflammatory diarrhea
▶ Diagnostic principles for infectious disease (Lab). Answer: Lab test
RT-PCR= early viral detection
ELISA= antibody detection
Mantoux= TB screening
IGRA= TB, no false positives from BCG
*Always correlate with timing of illness, immune status and clinical
presentation
▶ Diagnostic principles for infectious diseases (imaging/ referral). Answer:
- CXR for suspected TB
-CT for severe abdominal infection
