Table 1:

Participant demographics

Variable	Non-Allergic N=13 N (%)	Allergic Reaction N=19 N (%)
Age at Enrollment with Median (Range)	36 (27–79)	42 (28–70)
Sex
Female	8 (62)	17 (89)
Male	5 (38)	2 (11)
Race
White	4 (31)	10 (53)
Asian	7 (54)	3 (16)
Black	1 (8)	2 (11)
Native American	1 (8)	0 (0)
Other/Mixed	0 (0)	4 (21)
Ethnicity
Not of Hispanic, Latinx, or Spanish origin	13 (100)	18 (95)
Hispanic, Latinx, Spanish origin	0 (0)	1 (5)
History of Allergies
Drug Allergic History	2 (15)	10 (53)
Food Allergic History	0 (0)	3 (16)
Latex Allergic History	1 (8)	0 (0)
Environmental Allergic History	2 (15)	2 (11)
Unkown Etiology Allergic History	0 (0)	1 (5)
No Allergic History	10 (77)	8 (42)
Days Between Vaccine and First Blood Draw, days (Median [Range])	0 (0–45)	21 (0–86)
IgG to PEG, ng/mL-Median (Range) in first sample	0 (0–405.21)	314.8 (0–6903.24)
IgM to PEG-Median (Range) in first sample	356.35 (0–2716.63)	203.22 (0–2107.27)
IgE to PEG, ng/mL (Median (Range) in first sample	0 (0–0)	0 (0–0)