The US is closely monitoring the situation in Russia after a laboratory worker at a plague research centre died, amid concerns over a possible infection. President Donald Trump said Washington was looking 'very strongly' at the case, while Secretary of State Marco Rubio said there was no cause for alarm but the situation was being watched closely. Russian officials have said no microorganisms linked to the woman's work were found in her samples, while reports that almost 200 people were placed under observation have added to concerns. #health #russia #trump #usa #news