یک کارمند تحقیقات طاعون در روسیه به علت نامعلومی درگذشت. این چیزی است که ما می دانیم

A plague research employee in Russia died from an unknown cause. Here's what we know

There are more questions than answers regarding the death of a plague research lab employee last week in Siberia. Here's what we do and don't know.