Despite the wide disparity in the figures, this new epidemic seems poised to eclipse the scale of the 2003 SARS epidemic, and is already well outside of the reach of simple control measures.
Hong Kong University virologist Guan Yi, who was part of the team that discovered the SARS virus, tells the Washington Post that the epidemic is so out of control now that "a bigger outbreak is certain." He said that even with a conservative estimate, the outbreak could be 10 times bigger than the SARS epidemic -- with a reach of more than 80,000 cases.
Speaking on background, other SARS veterans tell me there may already be "many thousands" of infected individuals in China.
Because authorities initially downplayed the seriousness of the outbreak instead of implementing swift control measures, people have traveled to and from Wuhan -- a major transportation hub with a population of 11 million people -- and unwittingly carried the virus with them.