Paragraph 1
The USA is worried after a
at a research
in Siberia died. Some newspapers suspect that she came into
with plague bacteria. She died after developing
pneumonia. Local
say she may have broken a test
of plague bacteria. Officials are checking
who were in contact with the worker. Russia said the woman's
was from "pneumonia of an unknown origin" and not plague. The US secretary of state said there was no "cause for
". However, he said officials should "keep an
on it".
