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I think we're very much on board with the idea that we simply can't be boosting people as frequently as we are, and I'm the first to acknowledge that this additional fourth booster dose that was authorized was a stopgap measure until we got things in place for the next potential booster, given the emerging data, it was done because of the amount of harm that has come to our older population in the United States with 1 in 100 individuals over the age 65 having died in the past two years of Covid-19, so we need to protect that population.