Emergency BriefcaseTeaching Library
Interactive clinical case

Rocky Mountain Spotted Fever

A child presents in summer with fever, severe headache, myalgias and nausea after outdoor exposure.

Score: 0/100Case progress: 1/3Critical actions: 0/3
1
Early illness

The case begins

A child presents in summer with fever, severe headache, myalgias and nausea after outdoor exposure.

No remembered tick bite. No rash. Platelets are low and sodium is mildly low.

Which of the following is the most appropriate next step?

2
Testing decision

New information

Select Reveal results to continue.

Acute serology is negative on day three. Fever and headache persist.

Which of the following is the most appropriate next step?

3
Reassessment

New information

Select Reveal results to continue.

The patient develops petechiae, confusion and hypotension.

Which of the following is the most appropriate next step?

Must not miss

Critical actions

Calculator / interpretation

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Interpretation rule

Use the result as decision support. Reconcile it with physiology, trajectory, local protocol and specialist input.

Error prevention

Common mistakes—and how to mitigate them

Waiting for rash

Mitigation: Treat the compatible syndrome; rash often appears later.

Ruling out with an early negative test

Mitigation: Understand timing and obtain convalescent testing when appropriate.

Avoiding doxycycline in children

Mitigation: CDC recommends doxycycline for suspected RMSF in all ages.

Recap

What the learner should carry forward

  1. Rash and recalled tick exposure may be absent early. Epidemiology plus syndrome should drive suspicion.
  2. Early tests may be negative. Treatment should not wait for laboratory confirmation.
  3. Late findings indicate severe endothelial injury and organ dysfunction. Early therapy is the preventable pivot.

Final score interpretation: 80–100 = strong; 50–79 = review missed decisions; below 50 = repeat the case.

Clinical boundary

Educational content only. Apply current local protocols, patient-specific factors, consultant guidance and clinical judgment.