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

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