By Kate Kelland LONDON (Reuters) - The World Health Organization (WHO) said on Thursday it remained worried about the spread of MERS, a respiratory disease that has infected and killed hundreds of people, overwhelmingly in Saudi Arabia. "Increased surveillance in many countries is needed to better monitor trends related to the spread of this virus." There is no cure or vaccine for MERS, which kills around 40 percent of its victims. First identified in humans in 2012, MERS is caused by a coronavirus, from the same family as the one that caused a deadly outbreak of SARS (Severe Acute Respiratory Syndrome) in China in 2003. The WHO said the MERS outbreak, which appeared to peak in Saudi Arabia in April and May last year, "is currently characterized by sporadic cases and clusters of cases in communities and in healthcare settings, mostly in Saudi Arabia".
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