Ah, 31 people in Florida were already vaccinated in phase 3.

https://twitter.com/SomeBitchIKnow

AstraZeneca COVID-19 vaccine study put on hold after adverse reaction

Sep. 8, 2020

"Standard review process triggered a pause to vaccination to allow review of safety data," says an AstraZeneca (NYSE:AZN) spokesperson after a Phase 3 study of its COVID-19 vaccine (developed with University of Oxford) has been put on hold across the U.S. after a suspected serious adverse reaction on a U.K. participant

https://seekingalpha.com/news/3612325-astrazeneca-covidminus-19-vaccine-study-put-on-hold-after-adverse-reaction