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The USA has raised
after a worker at a plague research
in Siberia died. Some newspapers suspect that she died after coming into
with plague bacteria. The 28-year-old
died after developing
pneumonia. Local reports say she may have broken a test tube containing plague bacteria. Dozens of hospital
have been quarantined. Officials are monitoring people who were in contact with the woman who died. Russia has said the woman's
was from "pneumonia of an
origin" and not plague. US Secretary of State Marco Rubio said there was no "cause for
". He said officials should "keep an
on it".
