Read Roald Dahl's Powerful Pro-Vaccination Letter (From 1988)

Roald Dahl – author of such books as Charlie and the Chocolate Factory, James and the Giant Peach, and Matilda – lost his eldest daughter, Olivia, to measles in 1962. Twenty-six years later, he penned a cogent and gut-wrenching plea to parents, urging them have their children vaccinated against the disease.

In light of measles' recent resurgence in the United States, Dahl's take on the seriousness of the disease, the importance of immunization, and the inanity of refusing to vaccinate "out of obstinacy or ignorance or fear," is as relevant today as it was when it appeared, in 1988, in a pamphlet published by the Sandwell Health Authority.

Measles: A Dangerous Illness Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn't do anything. "Are you feeling all right?" I asked her. "I feel all sleepy," she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was twenty-four years ago in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. I was unable to do that for Olivia in 1962 because in those days a reliable measles vaccine had not been discovered. Today a good and safe vaccine is available to every family and all you have to do is to ask your doctor to administer it. It is not yet generally accepted that measles can be a dangerous illness. Believe me, it is. In my opinion parents who now refuse to have their children immunised are putting the lives of those children at risk. In America, where measles immunisation is compulsory, measles like smallpox, has been virtually wiped out. Here in Britain, because so many parents refuse, either out of obstinacy or ignorance or fear, to allow their children to be immunised, we still have a hundred thousand cases of measles every year. Out of those, more than 10,000 will suffer side effects of one kind or another. At least 10,000 will develop ear or chest infections. About 20 will die. LET THAT SINK IN. Every year around 20 children will die in Britain from measles. So what about the risks that your children will run from being immunised? They are almost non-existent. Listen to this. In a district of around 300,000 people, there will be only one child every 250 years who will develop serious side effects from measles immunisation! That is about a million to one chance. I should think there would be more chance of your child choking to death on a chocolate bar than of becoming seriously ill from a measles immunisation. So what on earth are you worrying about? It really is almost a crime to allow your child to go unimmunised. The ideal time to have it done is at 13 months, but it is never too late. All school-children who have not yet had a measles immunisation should beg their parents to arrange for them to have one as soon as possible. Incidentally, I dedicated two of my books to Olivia, the first was 'James and the Giant Peach'. That was when she was still alive. The second was 'The BFG', dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children.

Dahl's letter remains eerily appropriate today, in light of the ongoing and expanding measles outbreak centered in California. More than 100 cases have now been confirmed in 14 states across the U.S., including Arizona, Colorado, Illinois, Minnesota, Michigan, Nebraska, New York, Oregon, Pennsylvania, South Dakota, Texas, Utah and Washington state. According to the latest figures from the California Department of Public Health, at least 91 of the cases are in California, 58 of which have been linked to the outbreak that began in Disneyland last month. The degree and scale of this outbreak (in the past thirty days, California has seen more confirmed measles cases than it typically sees in a year) has been pinned to the obstinacy, ignorance, and fear of those who would refuse their children, and anyone else unable to vaccinate for legitimate medical reasons, the protection immunization affords.

"It is not yet generally accepted that measles can be a dangerous illness," Dahl wrote in 1988.In 2015, many people still fail to fully recognize the dangers posed by measles, a grave and wildly contagious viral infection. Experts suspect many of us cannot appreciate the severity of a measles infection, because we have not lived through an epidemic; but the symptoms of measles – an airborne virus that Stephen Cochi, senior adviser with the CDC's global immunization division, calls "probably the most contagious infectious disease known to mankind"– are as serious as they are ghastly to behold.

Measles is a dangerous illness. It's also preventable, thanks to a safe, affordable, highly effective vaccine. Epidemiologists know this. The CDC knows this. The World Health Organization knows this. The White House knows this. And, though he sadly did so more keenly and more personally than most Americans ever will, Roald Dahl knew this – just as any clear-headed person alive today knows it.

The Guardian, in its November 1990 obituary for Dahl, called the beloved author "a children's champion." Certainly, the sprightly genius behind such books as Charlie and the Chocolate Factory, James and the Giant Peach, Matilda, Fantastic Mr Fox, and The BFG had more than earned the title. But the designation is so meaningfully augmented by Dahl's outspoken support of child vaccinations, and his condemnation of those who would ignore its benefits for reasons senseless and unfounded.

Fifty years ago, there was a good and safe measles vaccine available to every family, and all you had to do was ask for it. In 1988, there was a good and safe measles vaccine available to every family, and all you had to do was ask for it. And today, there is a good and safe measles vaccine available to every family.

All you have to do is ask for it.

Correction: This post originally stated Dahl's pro-vaccination piece was published in 1986. It was published by the Sandwell Health Authority in 1988.