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I can only speak for my state since I am connected to the process through my job, but here it is based on requisition date. Pfizer was the first to made available in AZ, followed by Moderna, which is now slightly more common than the Pfizer. Johnson and Johnson was the last vaccine requisitioned here, so it is basically filling in the remaining demand based on the DHS allotment/distribution.
J&J is mainly available through family Medical practices, which are receiving their vaccines after the Pharmacies and Public Health centers were already queued up, so very few Pharmacies have J&J. And since it is one dose, those appointments are tougher to get by both available supply and demand.
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