After a quarter-century of near-elimination, measles is again filling pediatric critical care units in the United States — and the clinical community may be underprepared for its severity. The return of a disease once considered a historical footnote demands that acute care teams relearn its trajectory, from initial presentation through potentially fatal neurological sequelae that can emerge years after the primary infection.
The epidemiological picture is stark. More than 2,200 cases across 48 discrete outbreaks were recorded in 2025 — the highest case count since 1992 — followed by an additional 2,073 cases in just the first half of 2026. The proximate driver is straightforward: declining MMR vaccination coverage has rebuilt the population-level susceptibility that herd immunity once suppressed. Measles itself remains one of the most transmissible pathogens known, with a basic reproduction number (R₀) estimated between 12 and 18 — far exceeding influenza or SARS-CoV-2. Clinical presentation follows the classic triad of fever, cough, coryza, and conjunctivitis, followed by a morbilliform rash, but the review emphasizes that severe respiratory failure and neurological complications — including encephalitis — can require ICU-level intervention and may manifest weeks to years post-infection. Management remains supportive; vitamin A supplementation represents the primary evidence-based adjunct to reduce severity.
This resurgence is a consequential public health inflection point for several reasons. First, the clinical workforce that trained after 2000 has little or no direct measles experience, creating a genuine recognition-and-response gap at the bedside. Second, the neurological complication subacute sclerosing panencephalitis (SSPE), a uniformly fatal sequela emerging years post-infection, underscores that the burden of a measles cohort is not fully captured in acute hospitalization data. Third, this literature review — while not a meta-analysis or RCT — draws on CDC, WHO, and peer-reviewed sources to offer a practical synthesis for critical care nurses who represent a frontline surveillance function. The findings are confirmatory rather than paradigm-shifting scientifically, but operationally important given the erosion of institutional knowledge around measles management in high-income settings.