This year, the U.K. has had more than 1,200 cases of measles, after a record number of nearly 2,000 cases last year. The country once recorded only several dozen cases every year. It now ranks second in Europe, behind only Romania.

Last month, emergency vaccination clinics were held every weekend in Wales, the epicenter of the outbreak. Immunization drives have also started elsewhere in the country, with officials aiming to reach 1 million children aged 10 to 16.

"This is the legacy of the Wakefield scare," said Dr. David Elliman, spokesman for the Royal College of Paediatrics and Child Health, referring to a paper published in 1998 by Andrew Wakefield and colleagues that is widely rejected by scientists.

That work suggested a link between autism and the combined childhood vaccine for measles, mumps and rubella, called the MMR. Several large scientific studies failed to find any connection, the theory was rejected by at least a dozen major U.K. medical groups and the paper was eventually retracted by the journal that published it.

Britain's top medical board stripped Wakefield of the right to practice medicine in the U.K., ruling that he and two of his colleagues showed a "callous disregard" for the children in the study, subjecting them to unnecessary, invasive tests. As part of his research, Wakefield took blood samples from children at his son's birthday party, paying them about 5 pounds each ($7.60), and later joked about the incident.

Still, MMR immunization rates plummeted across the U.K. as fearful parents abandoned the vaccine ' from rates over 90 percent to 54 percent. Wakefield has won support from parents suspicious of vaccines, including Hollywood celebrities like Jenny McCarthy, who has an autistic son.

Nearly 15 years later, the rumors about MMR are still having an impact. Now there's "this group of older children who have never been immunized who are a large pool of infections," Elliman said.

The majority of those getting sick in the U.K. ' including a significant number of older children and teens ' had never been vaccinated. Almost 20 of the more than 100 seriously ill children have been hospitalized and 15 have suffered complications including pneumonia and meningitis. One adult with measles has died, though it's unclear if it was the disease that killed him.

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