Understanding Measles: What It Is and How to Keep Your Family Safe

Measles is a viral infection caused by the measles virus (a member of the paramyxovirus family). It mainly affects the respiratory system and skin and is best recognised by its characteristic red rash.  In the early stages it can often look like a bad cold or flu.

Historically measles was common in childhood, and before vaccination it caused many more serious illnesses and deaths worldwide.  Thanks to vaccination programmes, cases dropped dramatically.  Unfortunately due to a drop in the number of children vaccinated there has been an outbreak more recently.

Common symptoms include a high fever, cough, runny nose and red, watery eyes, followed a few days later by a red blotchy rash that typically starts on the face and spreads down the body. Small white spots inside the mouth (Koplik spots) are a distinctive early sign, though you won’t always see them.

Measles is primarily an airborne virus. This means tt spreads when an infected person coughs or sneezes and releases tiny droplets that contain the virus.  The virus can hang in the air or remain on surfaces for a short time, which makes it easy to catch or spread when people are close to each other, such as in classrooms, nurseries and household settings.

The contagious period usually begins a few days before the rash appears and continues for around four days afterwards. 

This means that someone can spread the virus before they or their parents realise they’ve got measles.  This is a big reason outbreaks can grow quickly.

Certain factors increase the risk of passing on the virus: close contact in enclosed spaces, low levels of vaccination, travel to areas with active outbreaks, and weakened immune systems in the household. Young infants, pregnant women and people with impaired immunity are particularly vulnerable to severe disease.

The easiest way to prevent measles is through vaccination. In the UK the MMR vaccine protects against measles, mumps and rubella in one injection. It’s a safe, well-established vaccine that’s been used for decades.

The standard NHS schedule normally gives the first MMR dose at around 12 months of age, with a second dose at around 3 years 4 months (often before starting school). These two doses provide very high levels of protection for most people.

There are also catch-up programmes for children and adults who missed doses.  If you’re unsure about your child’s vaccination history, check their red book, contact your GP or local clinic — they can advise and offer catch-up jabs where needed. Some people should not receive the live MMR vaccine (for example, certain severely immunosuppressed individuals and pregnant women), so clinicians will advise alternatives or timings in those cases.

Herd immunity matters.   This is a term which is used when most of a community has had a vaccine.  It means that the virus has fewer opportunities to spread, and people who can’t be vaccinated are better protected.  That’s why high local uptake is important: outbreaks tend to happen in areas where too many children are unvaccinated.

Early recognition helps you get treatment sooner and reduce the chance of passing the virus on. The first signs are usually non-specific: high temperature, cough, runny nose and sore, red eyes. These symptoms can look like a bad cold or flu and may last a few days before the rash starts.

Koplik spots — tiny white spots inside the mouth — are a helpful clue if you spot them, but they are not always visible to parents. The classic measles rash appears a few days after the initial symptoms. It typically begins on the face and behind the ears and then spreads down the body, forming blotchy red patches that may merge.

Watch closely for warning signs that need prompt medical attention. Seek urgent advice if your child has difficulty breathing, becomes unusually drowsy or confused, has persistent vomiting, shows signs of dehydration (dry nappies, sunken eyes, reduced tears), or experiences a fit/convulsion.

For milder cases at home, supportive care helps: keep your child comfortable, encourage fluids, control high temperatures with paracetamol (following dosing guidance), and let them rest. Avoid aspirin in children under 16 due to the small but serious risk of Reye’s syndrome.

• Initial symptoms: fever, cough, runny nose, sore/red eyes
• Distinctive signs: Koplik spots, then spreading red rash
• When to seek help: breathing problems, dehydration, fits, extreme drowsiness

If measles is confirmed or strongly suspected, the first action is to isolate the child.  Keep your child at home and away from school or nursery until at least four days after the rash appears, to reduce the risk of infecting others.

Let your GP or local health service know by phone rather than turning up in person as they will need to notify relevant people.  It also reduces the risk of spreading it to others. Your clinician will confirm the diagnosis and advise whether any additional steps are needed for household members, especially anyone who is unvaccinated, pregnant, or those who are immunocompromised.

Managing symptoms at home is mainly supportive. Encourage them to drink regularly, give paracetamol for fever and discomfort, and encourage plenty of rest. Humidified air and saline nasal sprays can help with cough and blocked noses.

It is important to keep a close eye on the child as symptoms can get worse, and some of the complications can be life-threatening.  Watch your child for breathing trouble, persistent high fever, severe ear pain, unsteadiness on their feet, or severe headache.

If someone in the household is at higher risk (a pregnant person, a baby under 12 months, or someone with a weakened immune system), the GP or local public health team may advise additional steps such as offering immunoglobulin or expedited vaccination to reduce risk. Follow their guidance promptly.