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KARACHI, Pakistan — Until recently, polio was considered a poor man’s problem in Pakistan — a crippling virus that festered in the mountainous tribal belt, traversed the country on interprovincial buses, and spread via infected children who played in the open sewers of sprawling slums.

But since the World Health Organization declared a polio emergency here last week — identifying Pakistan, Syria and Cameroon as the world’s main reservoirs of the virus — the disease has become an urgent concern of the wealthy, too.

A WHO recommendation that travelers not leave Pakistan without a polio vaccination certificate has caused confusion. Doctors, clinics and hospitals have been inundated with inquiries. The association of travel agents has reported “panic” among air travel customers.

“It’s very worrisome,” said Mohammad Akbar Khan, a passenger at the Karachi airport on Thursday, as his family clustered around a desk on the departures concourse normally used to immunize infants. “We just found out about this on the news, and we’re trying to find out what to do.”

The government, which is scrambling to meet the WHO requirement, says it needs two weeks to make arrangements at airports and buy more vaccines. But to most Pakistanis, it is a jolting reminder of the gravity of a crisis that has been quietly building for years, and which is now, according to the WHO, spilling into other countries, threatening to undo decades of efforts to eradicate polio across the globe.

Despite years of multimillion-dollar immunization campaigns, led by the government and international organizations, this year Pakistan reported 59 new polio cases, by far the most of any country. The WHO had reported only 68 cases worldwide as of April 30.

Instability is driving the crisis. The Taliban, which had long opposed the vaccinations as part of what its leaders said was a Jewish conspiracy, has stymied immunization efforts in the northwest and the tribal belt, where infection rates are highest. The Taliban have forbidden vaccinations in North Waziristan for years, and killed vaccination teams in other areas.

Suspicions among the Taliban and others that the vaccination campaign was an espionage effort gained currency after 2011, when a covert, CIA-financed vaccination campaign used to try to find Osama bin Laden came to light.

The sense of urgency that has gripped health professionals for years, however, was largely absent among the upper class, who have had limited exposure to polio. “There was a total disconnect” in society about the problem, said Anita Zaidi, a pediatric infectious diseases expert and a member of the National Immunization Technical Advisory Group.

Some of the highest refusal rates for polio vaccination were recorded in wealthy Karachi neighborhoods, where residents had little faith in public health care, Zaidi said, citing a 2011 study.