The outbreak of Legionnaires’ disease hitting New York City is the worst in the city’s history.

It has so far killed 12 people and infected more than 120. Officials have ordered an enormous clean-up operation in an attempt to eradicate it from the city. CCTV’s Nick Harper filed this report from New York.

More details:

• The disease was first documented in the US in 1976 and named after the attendees of an American Legion Convention taking place in Philadelphia at that time.