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A top official with the World Health Organization said Wednesday it doesn't know how a lab worker in Siberia died, and she urged Russia to provide more information about a case that prompted global concerns about suspected pneumonic plague.

Maria Van Kerkhove, WHO director of Epidemic and Pandemic Management, said the U.N. health agency doesn't know what the "causative agent" was behind the woman's Oct. 2 death, which unconfirmed reports in Russia blamed on pneumonic plague—a less common but severe form of plague that can spread from person to person.

In its tersely worded statements, Russia's public health watchdog, Rospotrebnadzor, does not link the case to pneumonic plague, saying only that the lab worker had contracted pneumonia of "unknown" origin and that "extensive" testing found no evidence her illness was caused by any of the pathogens she worked with at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East.

"We don't understand how she was infected," Van Kerkhove said. "We need information in a timely way. We need regular information. We need answers to the follow-up of the questions that we have asked."

"We have posed these questions to our colleagues in the Russian Federation. In fairness, they have responded. We've gone back with more questions," she said.

N. health agency has more questions than answers about the situation at the lab, which focuses on plague and was founded about a century ago to study the disease in Siberia, where it occurs naturally in wild animals.

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