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For some of the reasons outlined in that article Dr. Robert Schooley. Infectious disease physician UCSD. Mentioned last month his best estimate is first quarter 2022 for the delta modification. He also mentioned if your in one of the categories the FDA is recommending a booster for he would do that and not wait for the modification. Probably another reason it’s not being switched right now. You might end up with millions that probably should do a boost waiting for manufacturing to catch up.