The World Health Organization (WHO) has declared a "public health emergency of international concern" over the global outbreak of novel coronavirus (2019-nCoV), reversing a week-ago decision by its International Health Regulations Emergency Committee. The move comes "not because of what is happening in China, but because of what is happening in other countries," said WHO Director General Tedros Adhanom Ghebreyesus, noting his confidence in China’s capacity to control the outbreak. "Our greatest concern is the potential for the virus to spread to countries with weaker health systems, and which are ill-prepared to deal with it," he said.