Annual Meningitis Case Counts in the United States
According to the latest CDC surveillance data, there are roughly 350 to 400 reported cases of meningococcal disease in the US each year, with bacterial meningitis accounting for a subset of these infections. The CDC tracks these figures through the National Notifiable Diseases Surveillance System and updates case counts annually in its meningococcal disease surveillance reports. These numbers reflect confirmed diagnoses across all 50 states and territories, and they help public health agencies measure the burden of the disease over time. For a detailed breakdown of current case counts and regional trends, see the CDC's official meningococcal disease surveillance page CDC Meningococcal Disease Surveillance.
Incidence rates are typically expressed as cases per 100,000 population and have remained relatively low in the US over the past decade, reflecting widespread vaccination efforts. The highest rates are observed in infants younger than 1 year, followed by adolescents and young adults, particularly those living in congregate settings such as college dormitories. The CDC's Advisory Committee on Immunization Practices regularly reviews these rates and updates its recommendations for routine meningococcal vaccination. This ongoing monitoring helps identify shifts in disease burden and informs public health priorities.
Serogroups, Vaccination, and Prevention Efforts
In the US, serogroups B, C, W, and Y cause the majority of meningococcal disease cases, with serogroup B and serogroup C historically accounting for the largest shares of annual infections. The Food and Drug Administration has approved several vaccines targeting these serogroups, including MenACWY and MenB vaccines, which are recommended for adolescents and certain high-risk groups. The CDC's immunization schedule outlines the ages and conditions under which these vaccines are routinely administered, and coverage rates are monitored through national health surveys. Detailed vaccine recommendations and serogroup distribution data are available on the CDC's meningococcal vaccine page CDC Meningococcal Vaccine Recommendations.
Vaccination has contributed to a significant decline in serogroup C and Y cases over the past two decades, though serogroup B continues to cause outbreaks on college campuses and in other close-contact settings. The CDC and state health departments investigate clusters of cases to identify at-risk populations and recommend targeted vaccination campaigns. Public health agencies also collaborate with healthcare providers to ensure timely diagnosis, antibiotic prophylaxis for close contacts, and reporting of confirmed cases. These coordinated efforts are essential for limiting transmission and reducing severe outcomes.
Risk Factors, Outcomes, and Data Sources
Key risk factors for meningitis in the US include age under 1 year, complement deficiency, asplenia, HIV infection, and residence in communal settings such as dormitories or military barracks. The CDC and the National Meningitis Association publish data on outcomes, including case-fatality rates and rates of long-term complications such as hearing loss, brain injury, and limb amputations. Early diagnosis and prompt treatment with antibiotics are critical for improving survival and reducing the risk of severe sequelae. The CDC's bacterial meningitis overview provides more information on risk factors and clinical outcomes CDC Bacterial Meningitis Overview.
Healthcare providers and laboratories are required to report suspected and confirmed cases of meningitis to state and local health departments, which then relay data to the CDC for national surveillance. The CDC publishes these data in the Morbidity and Mortality Weekly Report and maintains interactive surveillance tools that allow users to explore case counts by year, age, and serogroup. Researchers and policymakers use these datasets to evaluate vaccine impact, allocate resources, and develop prevention strategies. For additional information on surveillance methods and data access, see the CDC's National Notifiable Diseases Surveillance System page