Send us Fan Mail Dr. Nathan Kupperman and Dr. Brett Bernstein, lead investigators on a landmark international pooled analysis published in JAMA, present the most comprehensive evidence to date on whether a lumbar puncture can be safely avoided in febrile infants under one month of age. Using a simple three-criteria rule — negative urinalysis, procalcitonin of 0.5 or below, and absolute neutrophil count of 4,000 or below — across more than 2,500 prospectively collected cases from multiple inte...