RebE, I also had J&J and recently Pfizer without waiting for CDC. It is not really a booster, just a delayed second dose by a different vaccine. Also, for those who hesitate about side effects: you can take one dose, and then think about second dose after some delay. There are already reports that side effects of the second dose are due to the short interval between them. Recommendations of 3-4 weeks are based on what was tested in phase 3s. The longer the time between doses, the less side effects are.
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