“This is very exciting,” said Dr. Ross Kedl, a professor of immunology at the University of Colorado Anschutz Medical Campus. “It’s another home run.” While some are quick to point out that both Pfizer and Moderna’s vaccines have higher efficacy rates, Kedl says it’s not as big of a difference as it seems. “The differences between 80% and 95% are not exactly quibbling, but they’re less significant than the overall message,” Kedl said. “We’re super excited when the flu vaccine has somewhere between a 30 and 60% efficacy.”