Official says WHO doesn't know exactly how a lab worker in Russia died in plague case

1. Sept. 29
   The lab worker was first hospitalized with cold symptoms.
2. Oct. 2
   She died in a hospital in Shelekhov.
3. Sunday
   Rospotrebnadzor said she was diagnosed with 'pneumonia of unknown etiology.'
4. Tuesday
   Trump said he would soon discuss the issue with Putin; Rospotrebnadzor issued its latest statement on the situation.
5. Wednesday
   Peskov said a Putin-Trump call hasn't been set but could be arranged quickly, and the WHO issued its statement on the case.

“pneumonia of unknown etiology”