Vive la vaccination!

Have you ever had a vaccination injection at the doctor’s office or at school? Then you’ve probably heard about the basics – how the injection helps ‘train’ your immune system by presenting it with a weakened version of an illness so that it’s ready to fight the real thing.

But did you know that your immune system has a massive library of antibody-making cells, with each one geared to combatting a specific infection? Or that some of your white blood cells become ‘memory cells’, remembering every infection that has ever attacked you? This video from the Oxford Vaccine Group explains…

How are vaccines made and tested?

Understandably, people are often concerned to know how well vaccines have been tested before they are used on human beings. In the UK, the standard for testing and monitoring of vaccines is higher than it is for most other medicines, because they are one of the few medical treatments given to healthy people (mainly healthy children). This means that the level of acceptable risk is much lower than it might be for a cancer treatment, for example. 

This graphic shows all the stages that a new vaccine needs to pass through before it can be given to people. It can take many years for a vaccine to pass through all the stages – for example, in the case of the MenB vaccine for meningitis (a dangerous bacterial infection which attacks the brain, blood and spinal cord), it took nearly 20 years from the first idea to the vaccine being licensed for use.

Want more detail? This infographic is based on an article from the Oxford Vaccine Group's website - click here to read more!

What impact has the invention of vaccination had on diseases?

Case study: Smallpox

Smallpox was a viral disease caused by the variola virus. It caused an illness which had lots of different symptoms – including making people develop a rash of pustules (large, painful fluid-filled sores) covering their entire body. On average, it took the rash 24 hours to cover the body and an additional three weeks for pustules to grow in size, form crusts and eventually fall off. The rate of death for the more common and dangerous variola major strain of the virus was estimated to be around 30%. People who survived would often be marked for life with scarring from the pustules, which could be very severe. 

Smallpox had been around since at least the time of the Ancient Egyptians, and there was no successful treatment other than letting the disease run its course. However, some groups of people in China and India practiced variolation – a technique of introducing people, especially young children, to the smallpox virus in the form of liquid from the pustules of ill people or dried pustule scabs which were inhaled in controlled quantities. This usually caused the person to develop a milder form of the disease, which then gave them immunity (although sometimes they unfortunately caught the full-blown version and died). At the end of the 18th century, the British doctor Edward Jenner extended this technique to pioneer the first ever true vaccination, using the related cowpox virus to protect patients. His discovery was based in part on information about variolation that Lady Mary Montague, the wife of a British ambassador, had sent back from Istanbul in the 1710s (Read more). 

Sophie Ochmann and Max Roser (2019) - "Smallpox". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/smallpox' [Online Resource]

This chart shows the share of deaths from smallpox in London (as a percentage against total deaths) from 1629 – 1902. Hover over or tap on the data points to compare the proportion of deaths caused by smallpox immediately before and after the vaccine was invented in 1796.

Tip: Jenner invented the smallpox vaccination in 1796 -- using a calculator, find the average share of smallpox deaths in the ten years before this (1786-1796) and the ten years after (1797-1807). Then compare these to the ten years after that (1808-1818). What happens over time? 

Footnote: Note the big jump in smallpox deaths in 1871 – this is an anomaly linked to the Franco-Prussian War of 1870, when transporting French prisoners of war who hadn't been vaccinated contributed to a smallpox epidemic which killed more than 500,000 people across Europe (Source).

Be aware that this data comes from a time when other standards, like cleanliness and access to trained health care workers, were also on the rise, so these factors might be playing a role too!

Following World War II, the World Health Organisation declared a resolution to eradicate smallpox around the world and launched its Intensified Smallpox Eradication Programme in 1967. The last known case ‘in the wild’ was reported in Somalia in 1977. Since then, scientists estimate that this has saved around 5 million people’s lives per year.

Sophie Ochmann and Max Roser (2019) - "Smallpox". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/smallpox' [Online Resource]

What about other diseases? 

After the invention of the smallpox vaccine, doctors and scientists got to work on creating vaccinations for other diseases. This graphic shows the reduction in infections and deaths in the United States after the introduction of each vaccine (click here to see a bigger version).

Samantha Vanderslott and Max Roser (2019) - "Vaccination". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/vaccination' [Online Resource]

Vaccines are generally highly effective in preventing deaths and disability caused by infectious diseases. They can even protect people who are unable to take the vaccine themselves – such as small babies and people with weakened immune systems – through something called “herd immunity” or “herd protection”. The Oxford Vaccine group explains…

So why would people not want to be vaccinated? 

Given all this, why would some people not want themselves or their children to be vaccinated? One relatively recent reason is a piece of discredited research published in the 1990s by former physician Andrew Wakefield, linking the MMR (Measles, Mumps and Rubella) vaccine with autism. Although this research was found to be based on false data and retracted by the medical journal which published it (and Wakefield has since been barred from practising medicine) the idea had taken hold in many people’s minds. At around this time many people also became concerned about the ethics of the big pharmaceutical companies manufacturing the vaccines, and about whether they were allowing their business interests to override their duty to protect people’s wellbeing. 

A 95% immunisation rate is required to maintain herd protection, but after Wakefield’s ‘research’ was published immunisation rates dipped below 80% in the UK, and measles infections rose (source). 

This video from SciShow explains some of the reasons why people continue to believe that vaccination is unsafe:

The UK immunisation rate for MMR is now back up over 90%, but it has been dropping over the past five years (2015-2019), and the UK recently lost its World Health Organisation status as a "measles-free" country (source). 

There can also be significant variation in people’s attitudes to vaccination around the world. This graph shows the percentage of people in different countries who disagree with the statement “Vaccines are safe” - hover over or tap on each country to see the exact percentage:

Which country has lower trust in vaccine safety, France or the USA? Are you surprised by this?

Would you have guessed that the UK rate is 8.7%, or would you have expected it to be lower or higher? 

However, Oxford researcher Dr Samantha Vanderslott argues that in addition to safety concerns, there are other reasons why people might not vaccinate. These include poverty and social exclusion, lack of access to adequate supplies of vaccine, and lack of accessible advice and support (Read more).   

This video from the BBC shows some of the ways in which Birmingham immunologist Dr Ayesha Hassan is working to break down some of these barriers in the UK Somalian community:

A short history of mental health  

In the past, people thought about mental illness in a variety of different ways. These might vary according to people’s cultures and the places in which they were living – for example, at some points in European history people might have associated the symptoms of some psychiatric illnesses with witchcraft or the idea of being possessed by demons, and unfortunately sometimes those affected were persecuted or even killed. 

At the court of Sultan An-Nasir Salah ad-Din Yusuf ibn Ayyub in Cairo during the 1100s some people thought ‘madness’ had something to do with possession by spirits, but they also believed that it could be caused by an imbalance of ‘humours’ or elements in the body. Some doctors also seem to have had a rudimentary understanding of the idea of depression, which they called ‘melancholy’. Muslim, Jewish and Christian doctors working at the Sultan’s court believed that people who were suffering from ‘melancholy’ needed pleasant company, music and the opportunity to engage with things they found interesting. They created herbal treatments and suggested activities such as reading good books on philosophy and religion to help. Learn more in this lecture by Daniel Nicolae. 

The image above was painted into a book around 1185, and may be a portrait of Sultan An-Nasir Salah ad-Din Yusuf ibn Ayyub. Credit: Public domain.  

In London during the 1600s and 1700s, people with serious mental illnesses were often locked up against their will in Bethlem Royal Hospital. 

This had been built as a very luxurious and modern hospital for people who were too ill to take care of themselves - but it quickly went downhill as the building became run-down and the hospital began to raise extra money by allowing visitors to tour the hospital in order to look at the patients, and even laugh at them and taunt them. The name “Bethlem” became shortened to “Bedlam”, and due to the poor conditions in which the patients lived “Bedlam” eventually became a synonym for any place or situation that was disordered, noisy and chaotic. Read more.  

The image below shows a patient, James Norris (sometimes known as William Norris), being held in restraints at “Bedlam” during the early 1800s. Images like this led people to campaign for better conditions for the patients. Credit: William Norris, shackled on his bed at Bedlam: Wellcome Collection.

What do you think? Did “Bedlam” make life better for people with serious mental illnesses, or did it make their lives worse? Consider that the alternatives to being confined to hospital may have been living on the street with no access to food or shelter.

During the Victorian period, people started to think a bit differently about mental health. Two new inventions - the railway and the ‘penny post’ which allowed people to send each other letters quickly and often - made many people feel that the pace of life was ‘speeding up’. They suddenly had to cope with lots of new information arriving in the post (some people got up to 12 mail deliveries a day!) and the ability to travel to different towns and cities very quickly. Many people worried about the impact of these stresses on their “nerves”, by which they meant their ability to cope with everyday situations and anxiety.

This might sound a bit familiar - people nowadays often report feeling similarly bombarded by emails and social media notifications or exhausted by aeroplane travel. The Diseases of Modern Life Project at Oxford University has spent the last few years studying images, documents and statistics from the past to learn more about how Victorian people understood the impact of stress on mental health - they explain more in the video below: 

https://www.youtube.com/watch?v=f-sZLH5hT80&list=PLclYOU_uQvJN9GVJu98sNAhIaJ-_hvb6M&index=2

How are things changing? 

Nowadays, there is an increasing shift in the media to share people's mental health experiences and to create greater awareness of what support is available - helping to make those who are suffering from mental illness feel less isolated. 

For example, the UK-based charity Comic Relief led a campaign in 2018 which involved a mix of celebrities and members of the general public sharing their experiences. The campaign suggested that mental illness can affect anyone at any stage of their life, and so we all need to take care of our mental health. The message that unites the speakers' experiences is the importance of talking to someone and not suffering in silence.   

https://www.youtube.com/watch?v=tv82K_M7o5A

At the same time, more and more schools are considering how mindfulness training and activities can be included in the support they provide to students. Researchers at the University of Oxford have been leading studies into this very area via the MYRIAD project. The project is based on the knowledge that childhood and the teenage years are a vulnerable time for the start of mental illness: 75% of mental disorders begin before the age of 24, and half by age 15 (Kessler et al., 2005). The Department of Health (2011) recommends that “By promoting good mental health and intervening early… we can help to prevent mental illness from developing and mitigate [reduce] its effects when it does”. With this in mind, the MYRIAD team have taken an 8-week Mindfulness course which is known to be effective in preventing depression and promoting mental health in adults, and adapted it to work and appeal to teenagers in a (mainstream) classroom setting. For a definition of mindfulness, check out our article in our ‘Are we getting unhappier?’ big question.

The role of digital technology and mental health

Through her work on the Be-GOOD project, Prof. Ilina Singh (Department of Psychiatry) studies young people’s ethical and moral understandings of key issues related to mental health. 

These include what it means to: experience personal agency (i.e. a sense of control over your choices); be a good citizen; lead a good life, and behave well. As part of this, the research team have focused on building digital tools to investigate young people’s moral and ethical attitudes to mental health innovations such as mental health apps. Another area of interest is young people's opinions on predictive technologies that could uncover the risk of mental ill health before symptoms have appeared.

Digital approaches to mental health service delivery could be seen as supporting young people in understanding their own mental health. On the other hand, these could be seen as over-generalising mental health challenges, or even encouraging young people to think they have a mental illness. This raises ethical tensions. For example, how should we balance the good that can come from better and more acceptable routes of access to mental health services for young people against the harms to personal identity and privacy that can accompany sharing deeply personal data on-line?

It also raises questions about what role a mental health app should play: should it replace or assist a doctor? Who is responsible for the ‘care’ offered and outcomes… Is it the app designers? The person who recommended the app in the first place? The app user? The technology itself? And how should new users be encouraged to join? Those suffering from mental health conditions may be especially vulnerable, and so apps and their designers should be mindful of the power they might have in shaping users’ thinking and behaviours. This is particularly important since the world of online mental health support is still a relatively unregulated space. And so Prof. Ilina Singh stresses the importance of taking what we know about what does and doesn’t work well with the face-to-face therapist-patient relationship, and trying to translate this to create online mental health tools (source).   

What does the future hold?  

Over time we are learning more and more about mental health, including how to treat mental illnesses and how to help patients manage their symptoms. In particular, researchers are interested in finding ways to support young people early on in settings such as school to prevent them from developing mental health problems in the future. Some researchers view digital apps as a potential method to effectively reach out to (some) young people. Alongside this, the media is giving a greater voice to those who face mental health problems through charity campaigns and beyond. This helps to break down the stigma (negative feelings) of mental illness while improving awareness.

That’s not to say that more work isn’t needed… In fact, the (UK) Youth Index, which measures young people's levels of happiness and confidence across various aspects of their lives, is at an all-time low compared to when this information was first collated 10 years ago (source). But in terms of developing our overall understanding and awareness of mental health, active steps are being taken.

Those big adverts on billboards all over the UK were clear... being overweight is bad for your health, just like smoking cigarettes. At least, that’s what a national campaign from the charity, Cancer Research UK told us. But many people criticised the ads, saying that Cancer Research UK were wrong to draw such a clear link between your weight and health and that the campaign was a type of 'fat shaming' (read more)

What everyone does agree on is that to keep generally fit and well, we should take some exercise, get some fresh air, and wear sunscreen so not to burn in the sun and increase our risk of skin cancer.

But if we do all these things, can we avoid disease completely?

Food for thought

Eating plenty of fruit and veggies certainly won’t do any harm to your health -- that’s key to a balanced diet. Dr Marco Springmann of the Oxford Martin Programme on the Future of Food recently helped write a report that says that people across the world eat too much salt, not enough wholegrain (like wholewheat pasta, oats, and brown rice), and definitely not enough fruit (source). This makes us more likely to get sick with things like heart disease or diabetes. Eating less processed and fatty food (takeaways, fry-ups etc.) can go a long way to improving our health. 

And, of course, if you can’t steer clear altogether, giving up smoking is a good idea. It helps the health of your heart and lungs and your body starts to repair itself within just a few hours of your last cigarette. Some people think cutting down on cigarettes bit by bit until you’re not smoking any at all is the best way to quit but actually research suggests that stopping all at once is most likely to be successful. A study led by Dr Nicola Lindson-Hawley from Oxford's Nuffield Department of Primary Care Health Sciences says that using things like nicotine patches or gum can help, but picking a day to throw the packs of cigarettes in the nearest bin is the best approach (source). (Of course, if that turns out to be too hard, then cutting down gradually is better than not cutting down at all and just carrying on as you are.)

Photo by Dean Xavier on Unsplash

Small change?

But it’s not as simple as that. Making a change to your lifestyle can actually be very difficult.

Let’s face it, the world is set up to make us less active! For example, about 74% of adults in the UK drive (up from just 48% in the 1970s) (source), and we can order anything we want online rather than leaving our house to look for it. So it’s no wonder that more and more people are heading towards unhealthy lives.

There are also some things that you might think you have complete control over but actually when you’re required to make changes, these changes are really hard to make. For example, what would you do if you were told that you had pre-diabetes (signs of a potentially dangerous health condition that affects how the body deals with eating sugar)? Would you lose weight? Step up a new exercise routine? Research has shown that you’d probably not do very much (source). This is because it’s tough to change the way you behave without lots of help and support from other people, plus some money on top. For example, it can be expensive to get hold of fresh and healthy food and pay for gym memberships or something similar. 

Plus, a lot has to do with what types of food we can access. ‘Unhealthy’ food is often cheaper than the 'good' stuff, and simple to get hold of at the nearest takeaway shop. This is particularly true if you can’t travel far because you don’t have your own transport easily available. Therefore, if you’re short of money, it can also mean that you might be more likely to put on weight. In fact, recent statistics show that 17 per cent of fast food shops are in the poorest areas of England with only 3 per cent of them in the richest areas (source). 

What do you think? Are there any ways you could make your lifestyle a bit healthier? Can modern living ever get in the way of this?

Money, money, money

So it’s clear that money has a lot to do with how healthy you are. For many years, doctors thought that kids in high-income countries were most likely to have asthma (a breathing condition that can make you cough and wheeze and generally struggle for air). But now, after decades of research, it turns out that children in poorer countries have very high rates of asthma too -- and can have worse symptoms (source). 

But why? It could be down to many things. Lack of free, high-quality healthcare, poor air quality, or post-traumatic stress from seeing bad things in the neighbourhood, like violence could all play a role. Stress or feeling sad can make your whole body run differently, including how you breathe. So it’s not just about getting the right medicine when you need it, it’s also about helping kids take care of their mental health and manage their symptoms if they’re suffering from stress, anxiety and/or depression.

Live forever young

The thing is, a lot of the illnesses or problems we face, especially as we get older, are down to our genes -- not just the way we live.

As you get older, you might be more likely to suffer from serious illnesses like heart disease, stroke, dementia, bronchitis and cancer, not because of anything you’ve done, but simply because of the way your body is made up. That said, many people are living longer because of better access to food, good medicine and vaccinations against illnesses that might have killed us a few decades ago. But because we are around for longer, this, in turn, means that we will get more illnesses over the course of our lifespan. 

So eat as well as you can, don’t smoke, and take regular exercise; research strongly suggests that this kind of lifestyle reduces your risk of getting sick or frailer as you get older. But sadly, no matter what we do, it doesn’t look like we can end disease completely... not with our current medical and technical understanding anyway. It seems just part of being alive.