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Herd immunity is a term used to describe how a population can become protected from a disease when a large enough percentage of people develop immunity to it. This immunity can come from either vaccination or previous infection. When herd immunity is reached, the disease finds it harder to spread, protecting even those who are not immune.

How Does Herd Immunity Work?

Herd immunity works by reducing the number of people who can catch and pass on a disease. If enough people are immune, the virus or bacteria has fewer opportunities to infect new hosts. This helps stop outbreaks and can even lead to the disease disappearing from a community.

The level of immunity needed to reach herd immunity depends on how contagious a disease is. Some diseases, like measles, require very high levels of immunity (around 95%) to stop transmission. Others, like flu, require a lower percentage.

Herd Immunity and COVID-19

When COVID-19 first spread across the world, scientists and health experts discussed whether herd immunity could be used to control the virus. The idea was that if enough people got infected and recovered, or were vaccinated, the virus would struggle to spread.

However, achieving herd immunity against COVID-19 has proven difficult because:

• New variants of the virus keep emerging.
• Immunity from infection or vaccination can weaken over time.
• Not everyone can be vaccinated, including some people with medical conditions.

While herd immunity may not completely stop COVID-19, high vaccination rates have helped reduce hospitalisations and deaths, making the virus less dangerous.

The Real-Life Impact on a Young Person

For teenagers, herd immunity has played a big role in bringing life back to normal. School closures, lockdowns, and restrictions made life difficult for many young people. Thanks to vaccines and increased immunity, social activities, education, and travel have become safer.

James Story:

James, 16, found it frustrating when he had to miss school and sports because of lockdowns. When vaccines became available, he wasn't sure whether he needed one because he thought COVID-19 mainly affected older people.

After learning about herd immunity, James realised that getting vaccinated wasn't just about protecting himself but also about protecting his family, friends, and teachers. He decided to get the jab, knowing it would help reduce the spread of the virus in his community.

How Can Herd Immunity Be Achieved?

There are two main ways a population can achieve herd immunity:

1. Natural Infection

When someone recovers from an infection, their immune system develops defences against the disease. If enough people get infected and recover, herd immunity could eventually be reached.

However, relying on natural infection is risky because:

• Some diseases can cause severe illness or death.
• Not everyone who recovers from an illness develops strong or lasting immunity.
• It can take a long time and result in many people becoming seriously ill.

2. Vaccination

Vaccination is a much safer and more effective way to achieve herd immunity. Vaccines train the immune system to recognise and fight diseases without making people sick.

For example, diseases like polio and measles have been controlled in many countries through widespread vaccination, achieving herd immunity and preventing large outbreaks.

Why Is Herd Immunity Important?

Herd immunity is important because it helps protect people who cannot get vaccinated, such as:

• Newborn babies who are too young for certain vaccines.
• People with medical conditions that prevent them from being vaccinated.
• Those with weakened immune systems, such as cancer patients.

When enough people in a community are immune, these vulnerable individuals are less likely to be exposed to the disease.

How Can You Help Support Herd Immunity?

Even as a teenager, you can play a role in helping your community stay safe from infectious diseases.

1. Get Vaccinated

Vaccines help build immunity and stop the spread of diseases. If enough people get vaccinated, outbreaks become less likely.

2. Encourage Others to Get Vaccinated

Talking to friends and family about the benefits of vaccines can help them make informed decisions.

3. Follow Health Guidelines

Even with high levels of immunity, good hygiene, mask-wearing in high-risk areas, and regular hand washing can help prevent the spread of infections.

Does Herd Immunity Mean a Disease Disappears?

Not always. Some diseases, like smallpox, have been eradicated through herd immunity and vaccination. Others, like flu, continue to circulate because the virus changes frequently.

COVID-19 is likely to remain in circulation for a long time, but achieving high levels of immunity can help manage its impact.

Challenges to Achieving Herd Immunity

There are several challenges to reaching herd immunity, including:

• Vaccine hesitancy some people are unsure or unwilling to get vaccinated.
• Mutations viruses can change, making previous immunity less effective.
• Unequal vaccine distribution some countries have lower vaccination rates due to limited access.

Final Thoughts

Herd immunity is an important way to protect communities from infectious diseases. While achieving herd immunity for COVID-19 has been complicated, vaccination has helped reduce the severity of the virus and allowed life to return to normal.

By understanding how herd immunity works, you can make informed choices about your health and contribute to keeping yourself and others safe.

How are you feeling?

It is really important that when we need help, we feel able to ask for it. This could be speaking to a parent, a close friend, a teacher or someone else you trust. Sometimes it can be really hard to share our feelings with other people but if we are feeling low or don't know where to turn, sharing with others is really important. Teachers will always take you seriously and listen to your problems in confidence if you approach them for help. Likewise, parents, siblings or friends will help you if you reach out to them.

If you feel like you can't speak to anyone you know, there are people and organisations that can help support you:

• Childline - Call them on 0800 1111 any time of the day or night, every day of the week
• NSPCC - Call them on 0808 800 5000 between 10am and 4pm Monday to Friday or email them on help@NSPCC.org.uk
• The Samaritans – Call them on 116 123 any time of the day or night, every day of the week
• SANE – Call 0300 304 7000 for support (4:30pm - 10:30pm every day)
• Mind – Call 0300 123 3393 (9:00am - 6:00pm Monday to Friday)

*Sometimes we will use real life examples in our articles to aid understanding. When we do, names and ages will be changed.