Measles: Symptoms, Types and Causes
Measles is
a highly contagious disease caused by a virus. Before the introduction of
measles vaccine in 1963 and widespread vaccination, major epidemics occurred
every 2–3 years and measles caused around 2.6 million deaths a year. The
disease remains one of the leading causes of death among young children
globally, despite the availability of a safe and effective vaccine. Measles is
caused by a virus in the paramyxovirus family and it is usually passed through
direct contact and through the air. The virus infects the respiratory tract, and
then spreads throughout the body. Measles is a human disease and is not known
to occur in animals. Accelerated immunization activities have had a major
impact on reducing measles deaths. During 2000–2016, measles vaccination
prevented an estimated 20.4 million deaths.
Symptoms
Measlessigns and symptoms appear 10 to 14 days after exposure to the virus. Signs and
symptoms of measles typically include:
- Fever
- Dry cough
- Runny nose
- Sore throat
- Tiny white spots with bluish-white centers on a red background found inside the mouth on the inner lining of the cheek —Koplik's spots
- A skin rash made up of large, flat blotches that often flow into one another
- The infection occurs in sequential stages over a period of two to three weeks.
Types
There are
two types of measles:
- Measles: caused by the rubeola virus.
- Rubella, or German measles: caused by the rubella virus.
Rubella
generally presents as mild but presents more of a risk to unborn
infants than young children in case a woman contracts the virus while she is
pregnant.
Causes
The cause
of measles is a virus that replicates in the nose and throat of an infected
child or adult.Whenever someone with measles coughs, sneezes or talks, infected
droplets spray into the air, where other people can inhale them. The infected
droplets may also land on a surface, where they remain active and contagious
for up to several hours.You can contract the virus by putting your fingers in
your mouth or nose or rubbing your eyes after touching the infected surface.
Who is at risk?
Unvaccinated
young children are at highest risk of measles and its complications.
Unvaccinated pregnant women are also at a higher risk. Any non-immune person - who
has not been vaccinated or was vaccinated but did not develop immunity - can
become infected. Measles is still common in many developing countries –
particularly in parts of Africa and Asia. The overwhelming majority of measles
deaths occur in countries with low incomes and weak health infrastructures.
Measles outbreaks can be especially deadly in countries experiencing or
recovering from a natural disaster or conflict. Damage to health infrastructure
and health services interrupts routine immunization, and overcrowding greatly
increases the risk of infection.
How to treat measles
There is no
prescription medication to treat measles. The virus and symptoms usually
disappear within two to three weeks. However, your doctor may recommend:
- acetaminophen to relieve fever and muscle aches
- rest to help boost your immune system
- plenty of fluids
- vitamin A supplements
Measles has
a low death rate in healthy children and adults, and most people who contract
measles virus recover fully. The risk of complications is significantly higher in children and adults with a weak immune system. You cannot
get measles more than once - after you’ve had the virus, you are immune for
life.
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