Clinical data
Value (N=13)
Age at diagnosis, mean (SD) [range] days 54.8 (16.1) [27-81]

Gender, N (%)

Gender, N (%)

Female 11 (84.6)
Male 2 (15.4)

Injection site, N (%)

Injection site, N (%)

Left deltoid 12 (92.3)
Right deltoid 1 (7.7)
First dose, N (%) 12 (92.3)
Pfizer/BioNTech vaccine, N (%) 13 (100)

Symptoms, N (%)

Symptoms, N (%)

Neck lump/fullness 13 (100)
Tenderness 6 (46.2)
Ultrasound scan, N (%) 13 (100)

Outcome, N (%)

Outcome, N (%)

Fully resolved 7 (53.9)
Partially reduced 5 (38.5)
Unknown 1 (7.7)

Time for clinical resolution, mean (SD) [range] weeks

Time for clinical resolution, mean (SD) [range] weeks

Fully resolved 3.1 (2.3) [1-8]
Partially reduced 8.4 (3.1) [5-12]