Over the weekend, the World Health Organization released a disease outbreak report on the events surrounding the death of a Russian infectious disease researcher earlier this month, highlighting that Russia has yet to report a confirmed cause of death. With that "key uncertainty," the United Nations health agency said it remains impossible to assess the risk of the event or whether the public health measures Russia took were adequate to prevent spread of the unknown disease.

The WHO reported that, so far, it has seen no evidence of ongoing transmission of the mystery disease. "However, confidence in the assessment remains limited by the absence of a confirmed etiological diagnosis, and the remaining uncertainty regarding the source and mode of exposure," the agency wrote in its report.

The agency laid out the order of events as information trickled out from Russian authorities, noting that it only became aware of the death via media reports on October 2. The WHO subsequently made contact with Russian authorities and requested information on October 3, 6, 7, and 8.

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