A 4-year-old boy presents to the emergency department with a 6-hour history of fever (39.8°C), irritability, and neck stiffness. On examination, you notice multiple small, dark red lesions on his trunk and lower extremities that do NOT fade when you press a clear glass slide against them. The lesions marked **A** in the diagram are consistent with petechiae. Which of the following is the most appropriate IMMEDIATE management step?

Explanation

## Why "Administer ceftriaxone 2 g IV and vancomycin within 30 minutes, without waiting for culture results" is right Non-blanching petechiae in a febrile child with meningeal signs constitute a dermatologic emergency suggesting meningococcemia (Neisseria meningitidis sepsis) until proven otherwise. The glass slide test (diascopy) confirms these are extravasated red blood cells that do NOT blanch—the hallmark of petechiae. Per Nelson 21e and Harrison 21e, empiric antibiotics MUST be started within 30 minutes of clinical suspicion, even before blood cultures or CSF analysis are obtained. Delays in antibiotic administration significantly increase mortality and morbidity from meningococcal sepsis and its catastrophic complication, Waterhouse-Friderichsen syndrome (bilateral adrenal hemorrhage leading to refractory shock and DIC). ## Why each distractor is wrong - **Obtain blood cultures and cerebrospinal fluid analysis before starting antibiotics**: This represents a dangerous delay. While blood cultures are essential, they should be obtained simultaneously with or immediately after antibiotic administration—NOT before. Waiting for culture results before treating suspected meningococcemia increases risk of fulminant sepsis, shock, and death. - **Perform a tourniquet test to differentiate meningococcemia from dengue fever**: Although the tourniquet test (≥20 petechiae appearing after 5 minutes of BP cuff inflation) is useful for dengue diagnosis, it is NOT the appropriate immediate step in a child with fever, neck stiffness, and non-blanching petechiae. Clinical suspicion of meningococcemia demands immediate antibiotic therapy; diagnostic refinement can follow after stabilization. - **Start dexamethasone 10 mg IV followed by empiric antibiotics after lumbar puncture is completed**: Dexamethasone should be given BEFORE or WITH the first antibiotic dose (conditional benefit in meningococcal disease; stronger evidence in pneumococcal meningitis). More critically, antibiotics must not be delayed pending LP completion. If LP is contraindicated (raised ICP, focal neurologic deficit, coagulopathy, hemodynamic instability—all possible in meningococcemia), antibiotics are started immediately without LP. **High-Yield:** Non-blanching petechiae + fever = meningococcemia until proven otherwise; start ceftriaxone + vancomycin within 30 minutes—do NOT delay for cultures or LP. [cite: Nelson Textbook of Pediatrics 21e, Chapter 218; Harrison's Principles of Internal Medicine 21e, Chapter 165]