Centers for Disease Control and Prevention officials scrambled to meet a United Airlines flight from Brussels at Newark Airport on Saturday afternoon, after a passenger believed to be from Ebola-wracked Liberia exhibited signs of the deadly virus.

The queasy passenger — who a law enforcement source said had been vomiting — and his daughter, who appeared to be about 10 years old, were fitted with surgical masks and were walked off United Airlines Flight 998 by CDC personnel in white hazmat uniforms.

The father and daughter, whose names were not released, remained in quarantine last night at University Hospital in Newark, the law enforcement source said.

The father had been outfitted from neck to toe in his own hazmat suit, his face still masked, by the time he was wheeled into the hospital’s trauma center.

The CDC and the hospital were releasing no information on the father’s condition as of early Saturday evening.

The remaining passengers aboard the United Airlines flight 998 were held on the Boeing 777-200 twin engine jet for about two hours, then were taken off and questioned for another couple of hours before being allowed through customs, multiple fliers told The Post.

“Two or three hours before we were supposed to land, it was announced that there was a medical emergency,” recalled passenger Dane West, of New Jersey.

“They didn’t say it could be Ebola. We really didn’t know what was wrong. When the guy walked off he didn’t look ill at all to me. He was wearing a face mask. Apparently he was sleeping and he woke up and felt air sick.”

Mark Wells, 42, of Randolf, NJ, said he and fellow passengers were puzzled at why a sick passenger was being kept on the plane.

“Then the CDC came on board in hazmat suits and they escorted him off,” Wells said of the yet-named passenger. “He looked sick, a little wobbly. The girl with him seemed fairly calm. They never said Ebola on the plane.”

Passengers described a chaotic scene of worry, disorganization and bizarre priorities. While no one mentioned Ebola, crew was specific about one thing: No photographs were to be taken.

“There was an announcement not to take any pictures,” said passenger Kengo Tomida, 30, an astrophysicist from Princeton, NJ.

Meanwhile, “I got upset on the plane,” he recalled of the 90 minute wait for CDC officials to board the plane.

“If it was Ebola or something serious, 90 minutes is too long to wait to take [the sick passenger] off the plane,” he said.

“Then when we got off the plane we had to fill out a long form with out contact information, name and address. No doctor examined us… it was not organized,” he said.

Airport officials eventually told them they were not at risk, passengers said.

“We were told it was nothing infectious,” said Tomida.

“The message they gave us was it wasn’t contagious,” said passenger Wells.

It is unclear how many Liberians had been on the plane. Brussels airlines had a Friday night flight out of Monrovia, Liberia’s capital; that flight connected to United Airlines, according to online records.

“The crew reported (during the flight) that a person was vomiting, and that Liberians were aboard the plane,” a law enforcement source told The Post.

“The person throwing up is believed to be Liberian,” the source said.

The jet had just completed a seven-hour flight across the Atlantic, and as it sat at Gate 53, Terminal B, the five-hour wait once the plane landed seemed to be an eternity to family members at the airport.

“It’s a concern not only for me but for every one of us,” Liberian Jah Zauyan, 44, said as he waited for three friends, who are also Liberian, to deplane.

“You hope it’s nothing. This is scary for the sick one,” Zauyan added.

“Someone comes to a strange land and they have to grab them and take them somewhere.”

Better here than in Africa, noted Liberian native Joshua Brown, as he waited for friends at Gate 53.

“I’m not worried for them,” he told The Post. ‘Because they are coming from Africa, and America is a better place to be” if you have Ebola, he noted.

“All the people brought here are cured from Ebola but there they die. America is a great country.”

Meanwhile, the first Ebola patient diagnosed in the US took a turn for the worse at a Dallas hospital Saturday, slipping from serious to critical condistion. Nine other people, including family members and health care workers, remain under isolation due to having had close contact with the patient, who caught ill in Liberia.

Additional reporting by Andrea Hay