The World Health Organisation (WHO) said its emergency committee, which includes global medical and policy experts, had flagged mounting concerns about the potentially fatal Middle East Respiratory Virus (MERS).
"They reached a consensus that the situation had increased in seriousness and that their concerns about the situation had also increased in terms of urgency," Keiji Fukuda, the WHO's health security head, told reporters.
The agency called on countries to improve infection prevention and control, collect more data on the virus and to be vigilant in preventing it from spreading to vulnerable countries, notably in Africa.
The vast majority of infections have been reported in Saudi Arabia, and cases outside the Gulf nation have largely involved people who had travelled there.
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Fukuda said that while Riyadh had done its best to stem the spread of MERS, a WHO team there still found "sub-optimal" infection-control and overcrowding in hospitals.
Saudi Arabia's agriculture ministry has urged citizens to wear masks and gloves when handling camels, which are thought to be the source of the mysterious corona virus in the Gulf state.
"It's clear is that there is no convincing evidence right now for an increase in the transmissibility of this virus," Fukuda said.
"If it is really associated with camels, and all of the infections are from camels to people and it does not become very transmissible among people, then I think that there's a reasonable chance that it would stay a regional infection, Fukuda added.