As the cases of 'black fungus' infections continue to rise in India, doctors and scientists worry if there is more to it than just the use of steroids. Mucormycosis, colloquially known as black fungus, is a serious fungal infection that was seen in far smaller numbers in India before Covid-19, too. But it is now affecting post-Covid patients in large numbers. As of May 22, the government has reported 8,848 cases of this fungal disease, which can lead to serious complications and has a high rate of mortality.