Coronaviruses is one of a family of RNA-containing viruses known to cause severe respiratory illnesses.The HPA said coronaviruses are causes of the common cold but can also include more severe illness, such as the virus responsible for Sars (Severe Acute Respiratory Syndrome).
This new virus, however, is different from any that have previously been identified in humans.
In 2003, hundreds of people died after a Sars outbreak in Asia.
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