The death of a worker at a plague research laboratory in Irkutsk, Russia, has triggered a public health emergency in the region. Authorities have imposed restrictions on hospital access and about 200 contacts are under surveillance. But much remains unknown. Firstly, whether the researcher died as a result of an infection acquired at her workplace — a claim denied by authorities but circulating on Telegram channels and in local media. This is what is known (and not known) so far.

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