The decision was made after a meeting of WHO's expert group on the Middle East respiratory syndrome (MERS).
Since 2012, MERS has sickened more than 500 people and killed 145, mostly in the Middle East. The vast majority of cases have been in Saudi Arabia, although the disease has spread within the region and to Asia, North Africa, Europe and the United States.
MERS often starts with flu-like symptoms but can lead to pneumonia, breathing problems and in severe cases, kidney failure and death.
Fukuda said there wasn't yet proof of the virus' sustained transmission among people.
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Last week WHO did declare the world's widening polio outbreaks to be an international health emergency.
Some scientists said while MERS technically meets the criteria for a global health emergency, declaring it as such could confuse the public.
"People might think (WHO) is crying wolf because MERS is still primarily a problem in the Middle East," said Michael Osterholm, an infectious diseases expert at the University of Minnesota who has worked in the Middle East.
The Netherlands' National Institute for Public Health and the Environment announced its first case of MERS today, a man who became infected during a visit to Saudi Arabia.
Experts say the spread of MERS is worryingly similar to the 2003 global outbreak of Severe Acute Respiratory Syndrome or SARS, which infected about 8,000 people in 2003, killing nearly 800. MERS is genetically related to SARS.
WHO said its expert committee would reconvene in several weeks to consider any new MERS developments.