Anti-vaxxers have been officially named by the World Health Organisation (WHO) as a threat to global health — which is something Roald Dahl would most likely to be happy about.

The anti-vaxxer movement is said to be to blame for the numerous outbreaks of measles and other diseases that had previously been fought by herd immunisation and vaccines.

The concept of anti-vaxxers has been around for decades and has become a controversial topic since the movement began.

Roald Dahl, the author best known for his children's novels The BFG, The Witches, Matilda and Charlie and the Chocolate Factory, wrote a passionate and personal letter to anti-vaxxers in 1986.

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In the letter, he shared a tragic story of how his daughter, Olivia, died in 1962 after contracting complications from the measles virus.

Although vaccines to combat measles wasn't available in 1962, Dahl wrote how he had already seen resistance from parents to vaccinate their children — something that is still happening today making his words even more prevalent.

The short letter was published in The Encephalitis Society Fact Sheet, but has since been available on the Roald Dahl Fans website.

The heartbreaking message remains a powerful testament to the importance of vaccinations and how not getting your children vaccinated could leave parents with a tragic consequence.

The heartbreaking letter

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.

British novelist Roald Dahl. Photo / Getty Images
British novelist Roald Dahl. Photo / Getty Images

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.

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 un immunised. 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 died in 1990.