human
I've been hearing a lot of news about a new type of vaccine. Is this vaccine safe?
assistant
It is important to understand that vaccines are designed to help protect people from infectious diseases, and they do so by stimulating the body’s natural defense mechanisms. Vaccines have been used safely for decades and are among the most effective public health tools available. They are also subject to rigorous safety testing before they can be approved for use in the United States. The Centers for Disease Control and Prevention (CDC) recommends that all children receive vaccinations against certain serious illnesses, including measles, mumps, rubella, polio, hepatitis B, and varicella.