What are vaccines, and how it works? Vaccines protect people from diseases. Vaccines work by injecting a small amount of weakened or killed bacteria, viruses, or other microorganisms into the body so that it can create an immune response. The vaccine is not contagious and will not make you sick if you contact someone already vaccinated. However, some vaccines require multiple doses over time to provide complete protection against certain illnesses like measles. Doctors recommend children get shots on schedule, and adults should check with their doctor about what they need as well! It's never too late to start getting your vaccinations. 1. Why do we need a vaccine? Vaccines are one of the best ways to prevent getting sick from certain diseases. They help our bodies build up antibodies that can fight infection before it ever gets a chance to take hold. Vaccines are essential because they keep us healthy and safe. 2. Who needs the hepatitis B vaccine? Hepatitis B is an in
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