The Middlesex-London Health Unit (MLHU) has declared the end of the legionnaires' disease outbreak that killed three people and infected 70 people, landing many in hospital.

It's the second year in a row that the legionella bacteria has made people sick in London, and again, the source of the outbreak is not known. This year's outbreak, which was declared on July 8, spanned a six-kilometre radius across the city and included the region's largest hospital. In mid-July, testing of Victoria Hospital's cooling towers came back positive.

Legionella bacteria found at London's Victoria hospital, officials say

In addition to those tests, the MLHU said it tested 26 other cooling tower sites, but could not find a match.

This heat map created by the MLHU, dated Jul. 22, shows the concentration of

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