Vaccine & Immunization Resources

Vaccines work by teaching your body how to recognize the virus or bacteria that causes a disease. They do this by giving your immune system a small or weakened version of the disease, so your body knows what to look out for. That way, if you later get infected with the real illness, your immune system is prepared to fight it off. Once you have had a vaccine, you gain antibodies and immune cells that can last for months or even years, keeping you safe from serious illness.  

Yes, vaccines are proven to be effective and safe. Every vaccine goes through multiple tests in clinical trials to prove effectiveness and limit side effects. After they are approved, they are continuously monitored for safety. 

Vaccines protect against a variety of diseases and illnesses, some of which can cause serious health issues, including long-term complications or even death. For a complete list of vaccines by disease, visit the Centers for Disease Control and Prevention (CDC) website.

Vaccines, like any medication, can cause side temporary side effects when administered — like a sore arm or low-grade fever. These are generally mild and only last for a few days.  

The benefits of getting vaccinated greatly outweigh the potential for side effects. Vaccines are safe, effective, and continuously monitored by the CDC to ensure ongoing safety.  

While vaccines are highly effective at preventing illness, no vaccine is 100% effective. It’s possible to still become infected after vaccination, but the vaccine typically helps reduce the severity of the illness and lowers the risk of serious complications.  

While it’s possible to still get infected, it’s important to remember that vaccines not only protect you, but also help protect those who are more vulnerable, such as the immunocompromised, infants who cannot yet receive certain vaccines, and older adults.