Supposedly, a lab tech was infected with Yersinia pestis -- plague -- in Russia.
The pneumonic version hits hard and fast, but caught early, antibiotics can treat, and lessen the effects or even cure it.
The bacterium is much larger than the virus that causes Covid-19, and an N95 mask should protect a wearer.
If it's the Black Death and it spreads quickly? They won't be able to keep a lid on that information.
@steveperry I've seen discussions saying that the pneumonic variant usually has an R0 of 1.3, so if you can contain just 30% of contacts you can block the spread. *However* this appears to be at a research institute that's part of the Russian biological warfare organization, so they might have been working on transmissibility …