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In reply to the discussion: UPDATE: U.S. Calls for Pause on Johnson & Johnson Vaccine After Clotting Cases [View all]BumRushDaShow
(128,844 posts)is that it didn't require people remembering to "come back" to get the 2nd dose. I guarantee that the "return for a 2nd dose" rate is NOT going to be "100%" among many populations in this city.
It was also easier to deliver a single-shot to hard-to-reach individuals like the homeless who are often moving from shelter to shelter or who are literally living on the streets, as well as to those many tens of thousands here who are "home bound" seniors and elderly (i.e., not in a facility and are either living alone at home or in an apartment and might or might not be or are being taken care of by a caretaker - whether paid or a family member). It also made it easier to deal with similar hard-to reach groups like the disabled (mentally and/or physically) in small congregate facilities.
I have an uncle who is no longer ambulatory and he was given the J&J shot last month during a home visit (he will be 78 this year).
So it's not so much the efficacy after one or two doses, but the reach and reducing the amount of follow-up logistics.