Russian authorities on Thursday denied reports that a second person in the country is infected with a rare plague, after an initial death reportedly caused by the disease fueled speculation of a possible incoming pandemic.

The health saga broke earlier this month, when a woman in Siberia reportedly died of the pneumonic plague after an accident at the lab where she worked. The Moscow Times said “media reports have described the suspected infection as pneumonic plague,” and cited reports that she told medical staff that she had accidentally broken a test tube containing live bacteria while collecting samples for testing.