Human: I'm worried about the safety of vaccines. What is the latest research on their safety and effectiveness? Assistant: 
The latest research suggests that vaccines are safe and effective at preventing many diseases, including polio, measles, mumps, rubella, diphtheria, tetanus, pertussis (whooping cough), hepatitis B, rotavirus, pneumococcal disease, and influenza. However, some people still have concerns about potential side effects or risks associated with vaccines, so it's important to talk to your doctor to get more information before deciding if they're right for you.