Paragraph 1
The USA is
after a worker at a
laboratory in Siberia died. She died of
pneumonia. Local reports say she may have broken a test
of pneumonic plague bacteria. Officials are checking
who were in
with her. Russia said the woman's
was from "pneumonia of an unknown origin" and not
. The USA said there was no "
for alarm". However, it said officials should "keep an
on it".
