Health and Human Services Secretary Robert F. Kennedy Jr., a noted vaccine skeptic, voiced support for the measles vaccine Sunday amid a deadly outbreak in the Southwest, mainly in Texas.

The warning against measles parties comes days after an unvaccinated child died of measles in Lubbock County about month after an outbreak began in West Texas.

Twenty-five years after the disease was declared “eliminated” in the U.S., cases are rising again, with a Texas outbreak now spreading to New Mexico. Measles cases continue to rise in the United States nearly two and a half decades after the virus had been declared eliminated in the country.