Chicago and Illinois

The Chicago Department of Public Health has issued a public alert after identifying seven adult cases of invasive Neisseria meningitidis infection since mid‑January, two of which have been fatal. Officials say they have traced close contacts for each patient and given preventive antibiotics to those potentially exposed, but are urging residents to watch for rapid‑onset symptoms such as fever, severe headache, stiff neck, vomiting and dark, bruise‑like rashes and to seek immediate care. While Chicago typically sees 10–15 meningococcal infections a year, mostly in winter, this early‑season cluster underscores that the disease remains a serious nationwide threat, with the CDC logging 503 confirmed and probable U.S. cases in 2024. Health authorities are reminding families that routine meningococcal vaccination should start at ages 11–12 with a booster at 16, and that early antibiotic treatment is critical because the illness can progress and turn fatal in hours. The warning especially applies to adolescents, young adults and older adults who are at higher risk and who may live, study or socialize in close quarters where saliva and respiratory droplets spread the bacteria.