Study reveals bubonic plague in New York subway

It is universally acknowledged that the New York subway is grubby.

What may come as a surprise is that it contains DNA fragments linked to anthrax and bubonic plague.

Researchers from Cornell University have provided the first map of the subway's microbes, identifying more than 1688 types of bacteria and one station that even supports a "marine ecosystem".

They say the vast majority of the bacteria is harmless to the 1.7 billion people who travel each year on 960km of track in America's largest city.