New York City's health department says all 12 cooling towers that were contaminated with the bacteria that causes Legionnaires' disease have been fully drained, cleaned and disinfected.

In the five ZIP codes affected by the outbreak, the number of inspections fell more dramatically than in the rest of the city.

Legionnaires' outbreak in Harlem claims a fourth life, with 99 infected and linked to contaminated water-cooling towers.

New York City will launch stricter rules for cooling towers after one of the worst Legionnaires’ outbreaks in years broke out in Harlem. The city Health Department plans on ramping up enforcement, penalties and reporting requirements for building water systems that are considered the source of many cases of Legionnaires’ disease.

Here’s what to know about water-cooling towers amid a cluster of Legionnaires’ disease cases in Central Harlem.