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The USA has concerns after a worker at a plague research laboratory in Siberia . Some newspapers that she died after coming into contact with plague bacteria. The 28-year-old worker died after developing severe pneumonia. Local reports say she may have a test tube containing plague bacteria. Dozens of hospital workers have been . Officials are people who were in contact with the woman who died. Russia has the woman's death from "pneumonia of an unknown origin" and not plague. US Secretary of State Marco Rubio said there was no "cause for alarm". He officials should " an eye on it".

Pneumonic plague can deadly. It the lungs and can cause death 18 to 24 hours after symptoms . It is highly contagious, so it can quickly. It can from person to person through the air when an infected person coughs or . The disease can be with antibiotics. However, antibiotics work best when they are given as soon as symptoms appear. Pneumonic plague is different from COVID-19, which is by a virus and not a bacterium. COVID-19 much more easily around the world than plague. Microbiologist Dr Simon Clarke told the BBC: "Pneumonic plague can spread from person to person, and that is why there the concern around this."