Chicago Reports Two Deaths as Meningococcal Disease Cases Rise Above Normal
Chicago health officials are investigating a recent increase in meningococcal disease after two adults died and at least seven others were diagnosed within a two-week period, a number that exceeds what the city typically sees in such a short time.
According to the Chicago Department of Public Health, the city usually records about 10 to 15 cases of meningococcal infections over the course of an entire year, most often during winter months. Meningococcal disease is caused by the bacterium Neisseria meningitidis and can lead to serious conditions such as meningitis—an infection of the brain and spinal cord lining—as well as bloodstream infections. While meningitis can be caused by several viruses and bacteria, infections linked to meningococcus are considered especially dangerous and can be fatal.
Health officials say the number of cases has been climbing in recent years. In a statement, the department noted that January 2026 has seen an unusually high number of cases for a single month and that investigators have not yet found clear connections among those infected.
At least two of the reported cases involved individuals staying at the same temporary homeless shelter, officials confirmed.
Early symptoms can resemble common illnesses, including fever, chills, tiredness, and nausea, but the disease can worsen rapidly and become life-threatening within hours. Medical professionals urge people to seek immediate care if symptoms escalate to include a stiff neck, sensitivity to light, cold extremities, intense muscle pain, vomiting, diarrhea, or a dark purplish rash.
Meningococcal disease does not spread as easily as respiratory illnesses like colds or flu. Transmission usually requires close and prolonged contact, such as kissing or living in the same household, through the exchange of saliva.
Even with prompt antibiotic treatment, the illness can be deadly. City health officials estimate that 10% to 20% of infected individuals do not survive. The disease most often affects older adults, teenagers, and young adults.
Dr. David Nguyen, an infectious disease specialist at Rush University System for Health, said the recent cases are concerning and noted that meningococcal infections have been increasing nationwide. He suggested that declining vaccination rates may be contributing to the trend.
Illinois currently advises that children receive the meningococcal ACWY vaccine at ages 11 or 12, followed by a booster shot at age 16.
Dr. Nguyen emphasized that most Chicago residents are not at significant risk unless they had close contact with someone who became ill. However, he said the situation serves as a reminder to stay up to date on recommended vaccinations.
“Most people aren’t living in close-quarter settings like dormitories, military housing, or shelters,” he said. “But in situations where exposure does occur, this disease can be extremely dangerous.”
The U.S. Centers for Disease Control and Prevention recently revised its childhood vaccination guidelines, reducing the number of vaccines broadly recommended for children. Vaccines that protect against meningococcal disease are now advised mainly for children considered at higher risk, leaving vaccination decisions for others to families and physicians.
Several medical organizations have criticized the updated guidance. The American Academy of Pediatrics has released its own immunization schedule that continues to broadly recommend meningococcal vaccination. That schedule has been endorsed by multiple major medical groups, including the American Medical Association.