What is 'Black Fungus' Found In Covid Patients? What Are The Symptoms And Treatment? Know It From Expert Mucormycosis is a deadly fungal infection found in some Covid-19 patients with uncontrolled diabetes and prolonged intensive care unit (ICU) stay. The infection which is also known as 'Black Fungus' affects the brain and the lungs. BY Dr. Sameer Kaushal 12 May 2021