Measles is caused by a type of virus called a paramyxovirus. It's transmitted in tiny droplets when an infected person coughs, breathes, or sneezes. Unlike the influenza virus, the measles virus can't survive for very long on objects like doorknobs and telephones. Nevertheless, it's an airborne virus, which means it is highly contagious. Research shows that only 10% of unvaccinated people who share a house with a measles patient escape infection.

For 1 or 2 weeks after an infection, the virus multiplies without causing any symptoms. This is called the incubation period. After that, symptoms such as cough, fever, runny nose, red eyes, and tearing will appear. Children may also become irritable.

About 2 days after initial symptoms appear, small, red, irregular spots with a whitish or bluish centre called Koplik's spots develop on the inside of the cheeks near the molars. About 2 days after Koplik's spots develop, a rash (large brown or red blotches) develops behind the ears, and perhaps on the forehead and face, and can spread to the trunk, arms, and legs. The rash usually begins to fade within 5 days, often starting at the top (head) before it clears up in the lower parts of the body (legs). Once the rash has completely disappeared, the skin may appear a bit brownish and the top skin layers may peel off soon afterwards.

The rash isn't painful and does not itch. Some people may experience increased sensitivity to light, and their eyes may become red and inflamed. During the peak of the infection, a fever usually develops with a body temperature as high as 40°C (104°F).

Measles is contagious for about 4 days before the rash appears and about 5 days afterwards. It's best for people with measles to stay away from others so they won't get infected.

Measles usually runs a simple course with few complications, but in certain cases, problems can arise. The most common complication is pneumonia, an infection of the lungs. Measles does not cause severe pneumonia itself, but it ties up the immune system and inflames the lungs so that bacteria can easily invade and "super-infect" the lungs. The signs of a bacterial infection include a severe cough that lasts for more than 5 days and yellowish or greenish sputum. If these symptoms develop, a doctor should be consulted right away. A second common bacterial infection that occurs as a result of tissue inflammation caused by the measles virus is a middle ear infection (otitis media).

In about 1 in 1,500 cases, measles can affect the brain, causing encephalitis. This usually happens during the late stages of infection, once the rash has already developed. Unfortunately, there's no cure, but some people may recover on their own without any further problems. Many people, however, are left with permanent problems such as seizures.

In a small number of patients, the virus can take permanent rest in the brain and be awakened years later to cause re-infection and brain damage. This results in a condition called subacute sclerosing panencephalitis (SSPE), which is often fatal. This is very rare, occurring in about 14 out of every 1 million cases of measles.

Measles can also cause complications such as hepatitis (inflammation of the liver) or appendicitis (inflammation of the appendix). Very rare complications include heart and kidney problems.

Pregnant women who catch measles have a greater risk of miscarriage.

It's important to detect measles as soon as possible, since the disease is contagious at an early stage. Your doctor will take a medical history and perform a physical exam to help diagnose measles. Common signs and symptoms such as rash, fever, cough, sneezing, and red eyes are easily noticeable and useful to diagnose measles.

If someone who's never had measles complains of cold or flu-like symptoms, looking inside the person's mouth can tell a lot. There are small, red, irregular spots called Koplik's spots that develop on the inside of the cheeks, near the molars. Each spot will have a whitish or bluish centre. Koplik's spots are a sure sign of measles and appear about two days after initial symptoms, which is about 2 days before the rash develops. Once doctors see these spots in the mouth, they usually don't bother with blood or tissue tests to make the diagnosis, but will order these tests for public health purposes to help control measles outbreaks.

Like the common cold, measles is a viral infection that the body will fight off and will go away with time. There are no medications that can kill off the virus, so the only useful treatments are those that help relieve symptoms. For example, medications like acetaminophen* or ibuprofen can reduce fever and other symptoms. Cough or sore throat medications may also help.

Doctors may prescribe high doses of vitamin A to children who have measles, especially those at risk. Children at risk include those who are in the hospital because of measles, and those who have a suppressed immune system, have a vitamin A deficiency, or have recently moved from countries where the death rate from measles is high.

Over 95% of children fully vaccinated against modern measles are protected against the disease. As far as we know, it is a lifelong protection. In about 15% of cases, people may get a very mild, non-contagious form of measles about 10 days after vaccination. This is due to the fact that the vaccine contains a live but weakened strain of the virus.

For mothers who've already had measles, their newborn babies are protected for about a year due to the transfer of special antibodies from the mother's immune system. Because of this, the measles vaccine may not work in a child's first year of life. The common practice in children is to vaccinate once at 12 to 15 months of age, and to give a booster shot at 4 to 6 years of age (before they attend school).The measles vaccine is commonly given in the same injection as the mumps and rubella vaccine, in what is commonly known as MMR vaccine.

The vaccine can prevent measles from developing in people who have been exposed to the virus, but it only works if it's given within 72 hours of exposure. Generally, the measles vaccine isn't given to babies less than one year old, pregnant women, or people with severely damaged immune systems. If a pregnant woman or newborn baby is exposed to the measles virus, they will be given a transfusion of immune serum globulin instead. This contains special antibodies that defend the body against the virus.

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