Thanks to the COVID-19 pandemic the world had come to a standstill with educational institutes and offices shutting to prevent transmission of the virus. Now as we slowly limp back to normal life in a post-lockdown scenario there are many things that may yet confront us. One danger that lurks ominously is Legionnaires’ disease. This is caused by the legionella pneumophila bacteria. When buildings are not in use the plumbing system closes down. Water in air-conditioning systems toilets and other plumbing in office buildings becomes stagnant. The temperature of stagnant water may reach anywhere between 77 and 108 degrees F.