New York Department of Health spokesman Monica Pomeroy said she could not release the minor’s age.
“In cases where the number of cases is small, patient confidentiality prohibits the department from disclosing this information,” Pomeroy said.
Previously, at least two other children in the U.S. have had cases of monkeypox, according to the U.S. Centers for Disease Control and Prevention.
One case involved a California toddler and the other involved a non-US resident infant.
Since the monkeypox outbreak began in May, most cases have occurred among men who have sex with men. But anyone can contract the virus through close skin-to-skin contact.
In the case of children, the CDC said, this could include “holding, cuddling, feeding, as well as shared items such as towels, bedding, cups and utensils.”
The agency has also developed new guidelines for health care providers on how to identify, treat, and prevent monkeypox in children and teens.