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Volume 29, Number 5—May 2023
Research Letter

Mpox among Public Festival Attendees, Chicago, Illinois, USA, July–August 2022

Emily A.G. FahertyComments to Author , Richard A. Teran, Stephanie R. Black, Vaishali Chundi, Shamika Smith, Brandon Bernhardt, Emma Weber, Bridget Brassil, Peter Ruestow, and Janna L. Kerins
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (E.A.G. Faherty); Chicago Department of Public Health, Chicago, Illinois, USA (E.A.G. Faherty, R.A. Teran, S.R. Black, V. Chundi, S. Smith, B. Bernhardt, E. Weber, B. Brassil, P. Ruestow, J.L. Kerins)

Main Article

Table

Characteristics of mpox case-patients attending MD event, by vaccination status before the event, Chicago, Illinois, USA, July–August 2022*

Characteristics All cases, n = 40 Vaccinated before MD, n = 15 Not vaccinated before MD, n = 25
Demographics†
Chicago resident 36 (90) 14 (93.3) 22 (88)
Male sex at birth 39 (97.5) 15 (100) 24 (96)
Median age in years, IQR 31 (27.3–35.8) 32 (29–35.5) 30 (25.5–35.5)
Reported male-to-male sexual contact 28 (70) 11 (73.3) 17 (68)
Race/ethnicity
Non-Hispanic or Latino White 18 (45) 8 (53.3) 10 (40)
Non-Hispanic or Latino Black 9 (22.5) 2 (13.3) 7 (28)
Hispanic or Latino
13 (32.5)
5 (33.3)
8 (32)
Sexual exposures
Reported having sex during probable exposure period 32 (80) 12 (80) 20 (80)
Reported having sex during MD 14 (35) 6 (40) 8 (32)
Sex with a main partner at MD 1 (2.5) - 1 (4)
Sex with a casual partner at MD 3 (7.5) 1 (6.7) 2 (8)
Sex with an anonymous partner at MD 7 (17.5) 4 (26.7) 3 (12)
Reported nonsexual skin-to-skin contact or kissing during probable exposure period 4 (10) 2 (13.3) 2 (8)
Reported sexual activity outside probable exposure period 1 (3) ND 1 (4)
Missing information about sexual exposures 1 (3) ND 1 (4)
Median no. sex partners at MD (IQR) 3.5 (1.3–5) 4 (2.3–5) 3 (1–5.3)
Met sex partners at MD 9 (23) 4 (26.6) 5 (20)
Met at another location 2 (5) 2 (13.3) ND
Met by using an online app
2 (5)
2 (13.3)
ND
Nonvaccine prevention measures‡ 28 (70) 12 (80) 16 (64)
Abstained from sex 9 (23) 2 (13.3) 7 (28)
Reduced number of sex partners 5 (13) 2 (13.3) 3 (12)
Avoided skin-to-skin contact 8 (20) 4 (26.7) 4 (16)
Wore more clothing 3 (8) 2 (13.3) 1 (4)
Other measures§
8 (20)
3 (20)
5 (20)
*Values are no. (%) except as indicated. Tests of significant differences by vaccination status were conducted by using Fisher exact tests and t-tests for continuous variables; no values were p>0.05. IQR, interquartile range; MD, Market Days; ND, no data.
†Percentages may not add up to 100% because of rounding.
‡Case-patients may have reported adopting >1 prevention measure.
§Other measures included isolating after the event and wearing protective clothing or a mask.

Main Article

Page created: March 06, 2023
Page updated: April 19, 2023
Page reviewed: April 19, 2023
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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