How dangerous is measles? 

27 March 2013

Many parents think of measles as a relatively minor disease that might cause a short period of illness, but will not leave any lasting damage. They might question whether vaccination against measles is necessary. These parents should read the passages below by Roald Dahl, whose daughter Olivia died of measles encephalitis in 1962. Measles causes encephalitis (inflammation of the brain) in one in every thousand children who get it. Encephalitis is still an extremely serious condition which is difficult to treat and almost always requires admission to an intensive care unit. Each year in the UK, several thousand unvaccinated children catch measles, and run the risk of encephalitis and death. (Also see the short films about measles complications on the measles information page.)

The following account of taking his daughter into hospital after she had collapsed at home was written by Roald Dahl in a school exercise book hidden away at the back of a drawer in his writing shed:

Awful drive. Lorries kept holding us up on narrow roads. Got to hospital. Ambulance went to wrong entrance. Backed out. Arrived. Young doctor in charge. Mervyn and he gave her 3mg sodium amatol. I sat in hall. Smoked. Felt frozen. A small single bar electric fire on wall. An old man in next room. Woman doctor went to phone. She was trying urgently to locate another doctor. He arrived. I went in. Olivia lying quietly. Still unconscious. She has an even chance, doctor said. They had tapped her spine. Not meningitis. It’s encephalitis. Mervyn left in my car. I stayed. Pat arrived and went in to see Olivia. Kissed her. Spoke to her. Still unconscious. I went in. I said, “Olivia… Olivia.” She raised her head slightly off pillow. Sister said don’t. I went out. We drank whiskey. I told doctor to consult experts. Call anyone. He called a man in Oxford. I listened. Instructions were given. Not much could be done. I first said I would stay on. Then I said I’d go back with Pat. Went. Arrived home. Called Philip Evans. He called hospital. Called me back. “Shall I come?” “Yes please.” I said I’d tell hospital he was coming. I called. Doc thought I was Evans. He said I’m afraid she’s worse. I got in the car. Got to hospital. Walked in. Two doctors advanced on me from waiting room. How is she? I’m afraid it’s too late. I went into her room. Sheet was over her. Doctor said to nurse go out. Leave him alone. I kissed her. She was warm. I went out. “She is warm.” I said to doctors in hall, “Why is she so warm?” “Of course,” he said. I left.

Over twenty years later, Roald Dahl wrote the following passage, aimed at parents who were refusing to give their children the measles vaccine...

Measles: a dangerous illness, by Roald Dahl

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. [Since this was written in 1986, the success of the MMR vaccination has reduced this figure to several thousand each year, but unvaccinated children are still at risk, and some do still die of measles].

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 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.

See also How ill does measles make you?


What you report here is exceptional and normally only experienced by children who are malnourished and ailing. The diseases mumps measles and rubella confer 100% immunity for life. The vaccines do no such thing. Immunised children catch measles as is being found in Wales, although those statistics will be suppressed. Vaccines make massive amounts of money and are unnecessary and in more cases than are published quite dangerous in themselves.


What you have blathered on about was ignorant and ill informed. What was reported was not exceptional at one time, it had nothing to do with malnourished, and as far as ailing a child is already ailing if they have measles, mumps, or rubella.

The diseases mumps, measles, and rubella may confer immunity for life, but they used to kill tens of thousands of children each year.

Get educated. Learn about reality.

Vaccinations and immunizations is why your child doesn't die. It's called 'herd immunity', learn about it.

To anonymous vaccine disbeliever

Wow..... Talk about misunderstanding evidence. No comment will ever dissuade you from your misinformed beliefs I assume. Good luck with that...

Measles and malnutrition

It is true that complications and deaths from measles are more common in chronically ill or malnourished individuals, however healthy, well-fed children are still at risk. (See this NHS film about a healthy, unimmunised girl left with permanent damage by measles infection.) After one dose of MMR vaccine, 90% of people develop immunity against measles, while after two doses, 99% are protected. This is not 100%, but when 95% of people have had the vaccine, it is enough to prevent outbreaks. What we are seeing in Wales is the result of low uptake rates (below 80% in some areas). Vaccines are rigorously tested before license and subject to ongoing monitoring (get more info on vaccine development and monitoring).


my child developed encephalitis from having the MMR immunisation she was left brain damaged and now has epilepsy she will never lead a normal life so no i would not recommend the MMR

The Encephalitis Society

The Encephalitis Society strongly advocates MMR vaccination to prevent measles encephalitis - read their Fact Sheet. There are reports of children developing encephalitis in the period following MMR vaccination (around 1 in a million), but no evidence that the vaccine actually causes the infection. See this article on MMR vaccine and encephalitis.


My sister aged 5 had measles. 10 days later, she developed measles encephalitis, I had by then caught measles and had double pneumonia and very sore eyes. my sister Jo was having convulsions, my mother, a nurse rang several Drs and eventually one of them sent an ambulance. Jo was not breathing when they arrived at hospital. My mother was told she it was unlikely that Jo would live the night and if she did, she would have severe brain damage. Jo recovered, she went back to school after about a year. she wasn't 'brain damaged', but she had been an incredibly bright child and now she struggled. It wasn't until she was in her thirtys that she managed to get A levels and went on to a degree, ending up a university lecturer. Her brain took years to recover fully. That was in the 60's. A vaccine was not around then. Please get your children vaccinated.
Tracey Hart

Brain damage

It seems your sister did experience brain damage. It is an awful word but describes any effects caused to the brain through illness and injury. It does not mean that are less of a person but as in your sister case "she had been incredibly bright but now struggles". My son has BD and looks normal to the world so please don't feel I am making judgement.