The new Mers virus, which has killed half of those infected, is "unlikely" to reach the same scale as Sars, ministers in Saudi Arabia say.
Most of the 90 Mers cases reported so far have been in Saudi Arabia.
Mers is from the same group of viruses as the common cold and Sars, which killed 774 people.
However, a detailed analysis of the Saudi cases, published in Lancet Infectious Diseases, did warn of "major gaps" in understanding of the virus.
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