A lab worker's death at a Russian plague research institute in Siberia has triggered quarantines and a flurry of unanswered questions, though the public health risk so far looks limited.

• A 28-year-old researcher at an anti-plague institute broke a test tube holding pneumonic plague bacteria, fell ill days later, and died.
• Russian officials insist no lab pathogens were found in her body and no one else is sick.
• Their actions say otherwise: hospitals closed for quarantine, 200 contacts under medical watch, and a mask mandate at a nearby aluminum plant with 2,000 workers.
• Plague is easy to cure with antibiotics if caught early, so the scale of the lockdown hints at something harder to treat — possibly a modified strain tied to lab research.
• The World Health Organization calls the risk to the general public low; the White House says it is monitoring, while former Congressman Adam Kinzinger wants flights to and from Russia banned.

Outlook: Expect Russia's official line to harden into "nothing to see here" while the real test is whether more infections surface in the region over the next week.