Exhibit 1:

Characteristics of PWID receiving COVID-19 vaccination, infectious disease testing, or both at the Baltimore City Health Department Syringe Services Program April 2021-June 2022

	Total		Infectious disease testing only		COVID-19 vaccine only		Both services
Characteristics	n=347		n=129		n=145		n=73
	n	%	n	%	n	%	n	%
Age (Mean, SD)	5	13	49	12.5	51	13	50	13
Gender
Female	108	31%	46	36%	47	32%	15	20%
Male	239	69%	83	64%	98	68%	58	80%
Race
Black	265	76%	89	69%	123	85%	53	73%
White	51	15%	19	15%	15	10%	17	23%
Other	16	5%	11	8%	2	2%	3	4%
Not specified	15	4%	10	8%	5	3%	0	0%
Ethnicity
Hispanic or Latino	9	3%	4	3%	3	2%	2	3%
Non-Hispanic or Latino	323	93%	115	89%	137	95%	71	97%
Not specified	15	4%	10	8%	5	3%	0	0%
Insurance
Insured	138	40%	0	0%	82	57%	56	77%
Uninsured	80	23%	0	0%	63	43%	17	23%
Not specified	129	37%	129	100%	0	0%	0	0%

Notes: All values are number and percent except for Age, which is mean and standard deviation.

Sources: Author’s analysis of linked abstracted data from the electronic health record where COVID-19 vaccine data was entered and the CAREWare database (the software maintained by the Health Resource and Services Administration (HRSA) Ryan White HIV/AIDS Program). Please list the other data sources here