The World Health Organization declared an end to its global health emergency over the spread of the Zika virus on Friday, prompting dismay from some public health experts confronting the epidemic.

An agency advisory committee said it ended the emergency — formally known as a Public Health Emergency of International Concern — because Zika is now shown to be a dangerous mosquito-borne disease, like malaria or yellow fever, and should be viewed as an ongoing threat met as other diseases are, sometimes with W.H.O. help.

Committee members repeatedly emphasized that they did not consider the Zika crisis over.

“We are not downgrading the importance of Zika,” said Dr. Peter Salama, executive director of the W.H.O.’s health emergencies program. “We are sending the message that Zika is here to stay and the W.H.O. response is here to stay.”

Like all mosquito-borne diseases, Zika is seasonal and may repeatedly return to countries with the Aedes aegypti mosquitoes that carry it, Dr. Salama added.