In May, a middle-aged-man suffering from Covid-19 was admitted in an intensive care unit (ICU) of a hospital in the eastern Indian city of Kolkata. As his condition deteriorated, the patient was put on a ventilator. He was administered steroids, a life-saving treatment for severe and critically ill Covid-19 patients. But experts say the drug also reduces immunity and pushes up blood sugar levels in patients. After a prolonged stay in the ICU, the patient had recovered and was ready to go home when doctors found he was infected with a deadly, drug-resistant fungus. Candida auris (C. auris), discovered a little over a decade ago, is one of the world's most feared hospital microbes. This bloodstream infection is the most frequently detected germ in critical-care units around the world and has a mortality rate of around 70%. "We are seeing an increased number of patients with the infection during the second wave of Covid-19. There are a lot of sick people in the ICUs and many of them are on high steroid doses. That could be the reason," Dr Om Srivastava, a Mumbai-based infectious diseases specialist, said.