Additional Study Information: The purpose of this study is to look for antibody evidence of mpox among the New York City community of men who have sex with men, non-binary, gender diverse, and transgender individuals. Mpox used to be called monkeypox. You do not need to have had a mpox infection or mpox vaccination to take part in this study. If you take part in the study, you'll complete a brief questionnaire about yourself, your health, and your experience and thoughts surrounding mpox. You'll then provide 1 teaspoon of blood and we'll send it to the United States Centers for Disease Control (CDC) in Atlanta for mpox antibody testing. Your blood sample and the information collected in the questionnaire will remain anonymous. The study consists of a single 30-minute study visit. If you're interested, please click on the "Do You Qualify?" button to see if you are eligible or please text or e-mail the contact information above and we'll get in touch with you. Appointments can be scheduled in mid-town Manhattan, Harlem, or the Bronx.