Measles - Symptoms,Causes, Diagnosis

What is Measles?

Measles is a highly infectious illness caused by a virus. The virus lives in the mucus of the nose and throat of people with this infection. Physical contact, coughing and sneezing can spread the infection. In addition, infected droplets of mucus can remain active and can be passed on by touching (they are contagious) for around two hours.

Once you are infected with the virus, the virus multiplies in the back of your throat and in your lungs. It then spreads throughout your body. The following are the most common symptoms of measles:

• A high temperature (fever), sore eyes (conjunctivitis) and a runny nose usually occur first.
• Small white spots usually develop inside the mouth a day or so later. These can persist for several days.
• A harsh dry cough is usual.
• Going off food, tiredness and aches and pains are usual.
• Diarrhoea and/or being sick (vomiting) are common.
• A red blotchy rash normally develops about 3-4 days after the first symptoms. It usually starts on the head and neck and spreads down the body. It takes 2-3 days to cover most of the body. The rash often turns a brownish colour and gradually fades over a few days.
• Children are usually quite unwell and miserable for 3-5 days. After this, the fever tends to ease and then the rash fades. The other symptoms gradually ease and go.

Most children are better within 7-10 days. An irritating cough may persist for several days after other symptoms have gone. The immune system makes antibodies during the infection. These fight off the virus and then provide lifelong immunity. It is therefore rare to have more than one bout of measles.

How is measles diagnosed?

Your doctor will usually be able to diagnose measles from the combination of your symptoms, especially the characteristic rash and the small spots inside your mouth. A laboratory test is also available for the diagnosis of measles.

Complications are more likely in children with a poor immune system, those who are malnourished, children aged under 5 years and adults. Many malnourished children in the world die when they get measles, usually from a secondary lung infection (pneumonia). 

More common complications include:

Eye infection (conjunctivitis).

Inflammation of the voice box (laryngitis).

Ear infection causing earache.

Infections of the airways, such as bronchitis and croup, which can be common.

Although these are distressing, they are not usually serious.

Less common complications of measles are listed below:

• A febrile fit (convulsion) occurs in about 1 in 200 cases. This can be alarming, but full recovery is usual.
• Brain inflammation (encephalitis). This is a rare but very serious complication. It occurs in about 1 in 5,000 cases. It typically causes drowsiness, headache and being sick (vomiting) which start about 7-10 days after the onset of the rash. Encephalitis may cause brain damage. Some children die from this complication.
• Liver infection (hepatitis).
• Pneumonia. This is a serious complication that sometimes develops. Typical symptoms include fast or difficult breathing, chest pains and generally becoming more ill.

What are the treatments for measles?

There is no specific medicine that kills the measles virus. Treatment aims to ease symptoms until the body's immune system clears the infection. For most cases, rest and simple measures to reduce a high temperature (fever) are all that are needed for a full recovery. Symptoms will usually disappear within 7-10 days.

The following measures are often useful:

• Children should drink as much as possible to prevent lack of fluid in the body (dehydration). Ice lollies are a useful way of giving extra fluid and keeping cool.
• Paracetamol or ibuprofen can be taken to ease fever and aches and pains. You should keep the child cool (but not cold).
• Antibiotics do not kill the measles virus and so are not normally given. They may be prescribed if a complication develops, such as a secondary bacterial ear infection or secondary bacterial lung infection (pneumonia).

Cough remedies have little benefit on any coughs.

Vitamin A supplements

Vitamin A supplements have been shown to help prevent serious complications arising from a measles infection. Supplements are generally recommended for children living in a country with a high prevalence of vitamin A deficiency. Treatment with vitamin A may be offered to people with measles.

When to see a doctor?

If you think you or your child may have measles, see a doctor to confirm the diagnosis. Most children recover fully with no complications or treatment. However, you should see a doctor again if symptoms get worse, or if you suspect a complication (see above).

The main serious symptoms to look out for are:

• Drowsiness.
• Lack of fluid in the body (dehydration). This may be developing if the child drinks little, passes little urine, has a dry mouth and tongue or becomes drowsy.
• Breathing difficulties.
• A fit (convulsion).

Measles immunisation

Immunisation is routine in the India as part of the measles, mumps and rubella (MMR) vaccine. Three doses are given  - the first for children aged 9 months, second dose at 15 months and third dose at 5 years of age. Immunisation gives excellent protection and so measles is now uncommon in India. However, unfortunately, measles is becoming more common again in children in some areas. This is due to some children not receiving the MMR vaccine. Measles immunisation can be given at any age and is sometimes offered to older children during outbreaks.

Is measles infectious?

Yes - it is very infectious. It is passed on by coughing and sneezing the virus into the air. It takes between 7 and 21 days (most commonly 10-12 days) to develop symptoms after being infected. (This is the incubation period.) You are infectious and can pass it on to others from four days before to four days after the onset of the rash. Therefore, children with measles should not mix with others and should stay off school.

What if You come into contact with someone with measles?

Some people have not been immunised against measles. Also, some people are more prone to complications if they get measles. In particular:

• Pregnant women
• Young babies under the age of 12 months
• People with a poor immune system - for example:
  • Those on chemotherapy.
  • People taking steroid medication.
  • People who have certain illnesses which affect their immune system, such as HIV.

If you or your child come into contact with someone with measles, you should see your