The most dangerous thing about an old health article is not what it gets wrong. It is that it still looks right. Plenty of COVID-19 advice written in 2020 is still online, still confident, and now out of date.

This page brings together the COVID-19 key facts as they stand today, based on current NHS and UK Health Security Agency (UKHSA) guidance. It covers what the illness is, the symptoms to look out for, what to do if you feel unwell, and which popular myths you can safely ignore. No medical background needed.

What Is COVID-19?

COVID-19 is an infectious illness that mainly affects the lungs and airways. It is caused by a coronavirus called SARS-CoV-2, which was first identified in Wuhan, China, in December 2019 and then spread worldwide.

For most people, COVID-19 now feels like a cold or flu, and most recover within a few weeks. Some people become more seriously ill, especially older people and those with a weakened immune system.

COVID-19 Symptoms to Look Out For

The symptom list has grown since the early days of the pandemic. According to the NHS, symptoms can include:

• a high temperature, or feeling hot, cold or shivery
• a new, continuous cough
• loss or change in your sense of smell or taste
• shortness of breath
• feeling tired or exhausted
• an aching body, a headache or a sore throat
• a blocked or runny nose
• loss of appetite, diarrhoea, or feeling or being sick

Many of these overlap with colds and flu, so you cannot tell which illness you have from symptoms alone.

What to Do If You Feel Unwell

The old “isolate for 7 days” rule no longer applies. Current NHS advice is simpler:

• If you have symptoms: try to stay at home and avoid contact with other people if you have a high temperature or do not feel well enough for your normal activities. You can go back to normal once you feel better or no longer have a high temperature.
• If you test positive (aged 18 or over): try to stay at home and avoid other people for 5 days after the day you took the test.
• If you test positive (under 18): try to stay at home and avoid other people for 3 days after the day of the test.
• Everyone who tests positive: avoid meeting people at higher risk of serious illness for 10 days after the test.

Most people do not need to test. If you are eligible for COVID-19 treatments because of a health condition, the NHS advises taking a rapid lateral flow test as soon as you get symptoms.

When to get urgent help

Call NHS 111 or contact your GP if you are worried, or your symptoms are getting worse or not improving. Call 999 or go to A&E if you are too breathless to speak in short sentences, have sudden chest pain, cough up blood, or collapse. The NHS COVID-19 symptoms and advice page has the full list, including specific advice for babies and children.

Simple Habits That Protect You and Others

Start from first principles. A respiratory virus needs a route from one person to the next, usually through droplets and particles in the air, or on hands and surfaces. Every good habit works by blocking that route:

• Wash your hands thoroughly and often with soap and water, or use hand sanitiser when you cannot.
• Cover your mouth and nose with a tissue when you cough or sneeze, then bin the tissue and clean your hands.
• Stay at home when you are unwell, so you are not passing an infection on to others.
• Get vaccinated if you are eligible.

Dental nurses call this way of thinking cross-infection control: finding every route an infection could travel and closing it. It sits at the heart of the NEBDN Level 3 Dental Nursing course, and it is the same logic you can use at home.

Separating COVID-19 Facts From Myths

Health myths spread quickly because they are simple and reassuring. Here are three that are still shared today:

• “Hot, humid weather stops the virus.” False. COVID-19 can spread in all climates, including hot and humid ones.
• “Eating garlic protects you.” False. Garlic is a healthy food, but there is no evidence that it, or any other herb or spice, protects against COVID-19.
• “Drinking alcohol prevents infection.” False. There is no evidence that drinking alcohol protects you, and drinking more can harm your health.

A useful habit is learning to separate signal from noise. Before you believe or share a health claim, ask three quick questions:

1. Who is saying this? An official health body, or an anonymous post?
2. What is the evidence? Studies and data, or a personal story?
3. Is it current? Health advice changes. Check the date, as this article itself shows.

COVID-19 Vaccines in 2026

Safe and effective COVID-19 vaccines have been available since late 2020. Today, vaccination is offered to the people at highest risk of becoming seriously ill. In England, the autumn 2026 COVID-19 vaccine programme is offered to:

• adults aged 75 and over
• residents in care homes for older adults
• people aged 6 months and over with a weakened immune system

Appointments began on 1 October 2026. If you are unsure whether you qualify, check the NHS website or ask your GP or pharmacist. Rules differ slightly across Scotland, Wales and Northern Ireland.

Why This Matters If You Are Interested in Dentistry

Dental teams work within inches of patients’ mouths and airways every day. That is why infection prevention is not an extra in dental nursing; it is the foundation. The best dental nurses use a habit called inversion: before each procedure, they ask “How could an infection spread here?” and close those gaps first. If that kind of careful thinking appeals to you, dental nursing could be a rewarding path.

Quick-action summary

• COVID-19 symptoms now include loss of smell or taste, tiredness, sore throat and a runny nose.
• Stay home if you have a high temperature or feel too unwell for normal activities.
• After a positive test: 5 days at home for adults, 3 days for under-18s.
• Garlic, alcohol and hot weather do not protect you.
• Vaccines are offered to those at highest risk; check your eligibility on the NHS website.

Please note: this article summarises NHS and UKHSA guidance as of November 2026. It is general information, not medical advice. Always check the NHS website for the latest guidance.

Thinking About a Career in Dental Care?

Understanding how infections spread, and how to stop them, is one of the most valuable skills in healthcare. Dental nurses use it every single day.

Ready to step into your potential and start a career that protects people’s health? Apply Now – School of Dental Nursing Application Form

Have questions first? Speak with an experienced advisor about whether dental nursing is right for you. Book a Call with an Advisor