What Is Middle East Respiratory Syndrome (Mers)?
Updated: 1:57pm UK, Wednesday 14 May 2014
Middle East Respiratory Syndrome coronavirus (Mers-Cov) is not highly contagious, according to the Centres for Disease Control and Prevention.
Saudi Arabia is at the centre of an outbreak of the disease in the Middle East that began two years ago.
It has mostly spread among health care workers.
At least 400 people have had the respiratory illness, and more than 100 have died.
All of them had links to the Middle East or to people who travelled there.
Mers-Cov is part of the coronavirus family that includes the common cold and severe acute respiratory syndrome (Sars), which killed 800 people worldwide 11 years ago.
It has been found in camels, but it is not known how it spreads to humans.
Cases tend to increase in the spring. Experts think this may be down to increased and better monitoring.
But Doctor W. Ian Lipkin, an expert on the virus, thinks this could be due to spring being when camels are born.
The virus can spread from person to person, but officials think this only happens after close contact.
Not everyone who is exposed to the bug becomes ill.
It appears to be unusually lethal, though.
Some estimates have it killing nearly a third of the people it infects - a far higher percentage than seasonal flu or other routine infections.
However, it is not as contagious as flu, measles or other diseases.
Currently, there is no vaccine or cure. There is no specific treatment, except to try to relieve the symptoms.
The CDC has yet to issue any warnings about travelling to countries involved in the outbreak.
Anyone who does develop fever, cough or shortness of breath within two weeks of travelling in or near the Arabian Peninsula should see their doctor and mention their travel history.
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