As vaccines for COVID-19 roll out, so do questions and concerns. Do they work? What are the side effects? Which one is more effective? Pfizer or Moderna? Different companies but both claim their vaccine to be 95% effective. Doctors all over the world are saying, not just having one but two vaccines is incredible. Dr. Elizabeth Connick, UArizona Chief of the Division of Infectious Diseases and BIO5 member, called the vaccine a home run. Overall, Dr. Connick said, the vaccines are the same but with a few differences, like effects.