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. 2021 Sep 17;4(9):e2125524. doi: 10.1001/jamanetworkopen.2021.25524

Figure 1. Study Flowchart.

Figure 1.

aNote that it is possible but not highly probable that some people received a COVID-19 dose outside Stanford Medicine during this time period. Most mRNA vaccine recipients during this time were Stanford-affiliated health care workers because public access to the vaccine was not authorized by the Santa Clara County Health Authorities for residents aged 65 years or older until January 26, 2021.

bT78.2XXA, anaphylaxis, initial encounter; T80.52XA, anaphylactic reaction due to vaccination, initial encounter; T78.2XXD, anaphylaxis, subsequent encounter; E949.9, vaccine or biological substance causing adverse effect in therapeutic use.