A suspected plague case in Russia has triggered quarantine measures after a 28-year-old woman working at an anti-plague research facility died of severe pneumonia.The incident occurred in the Irkutsk region of Siberia, where the woman, identified in reports as Daria Shipilova, worked at the Irkutsk Anti-Plague Research Institute. Reports said she may have accidentally broken a test tube containing the bacterium that causes pneumonic plague while collecting samples on September 25. However, Russian health authorities have not confirmed that she contracted plague.Nearly 200 people who may have had contact with her have been placed under observation, while quarantine measures have been introduced at healthcare facilities in the area. The development has also caught the attention of the US government. A Trump administration official told Axios that the White House “is aware, monitoring the outbreak, and assessing options.” What Happened At The Siberian Lab?Also read: COVID-19 Disrupted Stroke Treatment, Care & Worsened Outcomes: Global Review Of 107 StudiesShipilova reportedly became very ill after the laboratory incident and developed severe pneumonia. She was hospitalised and later died despite being placed on ventilator support.Reports about the suspected exposure have come from Russian media and other outlets, but the exact cause of her death remains officially unresolved. So it cannot be concluded if she died due to the plague.The head of the neighbouring republic of Buryatia, Alexei Tsydenov, said earlier that the 28-year-old woman died “possibly from the plague.” He also noted that “there are no plague outbreaks” in Buryatia.On Friday, the governor of Irkutsk, Igor Kobzev, urged citizens to remain calm, saying that an extraordinary meeting of the regional anti-epidemic commission was held with Russia’s chief state doctor. The meeting was in connection with a “suspected case of a particularly dangerous infection affecting a resident of the region,” Kobzev said on Telegram, according to KCRA. Russia's federal health authorities have described the illness as pneumonia of unknown cause, rather than confirming plague. An official, however, has already referred to the case as plague. That is alarming even though, at present, there is no confirmed evidence of widespread plague transmission.“The sanitary and epidemiological situation in the Irkutsk region, the cities of Irkutsk and Shelekhov is stable,” Rospotrebnadzor, the national public health and consumer protection agency of the Russian Federation, said. What Is Pneumonic Plague?Also read: Trump Says He ‘Psychologically’ Needs To Pop Aspirin Every Day: But Is It Actually Safe?Plague is caused by the bacterium Yersinia pestis. It has historically caused devastating outbreaks. The deadly infection still occurs in parts of the world.There are various forms of plague. Pneumonic plague affects the lungs and is the form that can spread directly from person to person through respiratory droplets.It can cause fever, weakness, headache and rapidly developing pneumonia. Without prompt treatment, it can become life-threatening.The good news is that plague is treatable with antibiotics, especially when treatment begins quickly.Nearly 200 People Being Monitored After Lab Worker's Death The medical observation measures are a precaution following the suspected exposure and death of the lab worker. Monitoring people who may have had close contact with a suspected pneumonic plague patient allows health authorities to identify symptoms quickly and provide treatment if necessary.Till now, the reports do not establish that these contacts have developed plague. The absence of secondary cases is enough to not describe the situation as a confirmed large-scale outbreak. Currently, there is also no evidence of international transmission from this incident as well.