Centers for Disease Control and Prevention (CDC)

The Centers for Disease Control and Prevention (CDC) protects Americans by tracking threats, guiding prevention, and responding to health emergencies at home and abroad (What the CDC Does).

Infectious disease detection & tracking

The CDC runs national surveillance and outbreak response systems that detect pathogens, guide containment, and inform public guidance (How the CDC Tracks Disease), including work on HIV and STIs (HIV Prevention, Testing, and Treatment / About STIs).

Vaccines & prevention

Vaccination policy, safety monitoring, and provider guidance are central to prevention efforts; see the 2025 Vaccine Guide and practical resources on where and how to get vaccinated (Where to Get Vaccinated).

Chronic, environmental & behavioral health

The CDC issues guidance and data on major long‑term health challenges—diabetes, heart disease, mental health, autism, ADHD, substance use and overdose prevention—and offers environmental safety guidance such as food and lead poisoning prevention (Diabetes and Heart Disease / The Opioid Crisis / Food Safety).

Get help & contact

For official guidance, data, or to contact the agency, consult the CDC contact and resource pages (How to Contact the CDC).