Additional Study Information: Some things about the recent mpox outbreak were different from past, smaller mpox outbreaks. That means not enough is known about how certain health issues related to mpox might continue to affect some patients months later. To understand this, researchers also need to compare some feelings, well-being, and behaviors of persons who had mpox with those of persons who did not have mpox. This research study can provide important new information. It might also help better reduce some of those problems in the future, and help reduce future mpox outbreaks. Study participation entails a one-time study visit. If you did not previously have mpox then you'll be asked to complete 1 questionnaire. If you did previously have mpox then you'll be asked to complete 2 questionnaires as well as have a brief medical exam from a healthcare provider. The questionnaires ask about your feelings, well-being, health, social activities, and sexual practices. About 400 persons will take part in this study. That includes about 200 persons who had mpox and 200 persons who did not have mpox. About 200 persons will participate in the at Columbia University Irving Medical Center.