Due to severe inflammatory reactions and diffuse alveolar damage, COVID-19 patients have a decline in their CD-4+ and CD-8+ T cell count, making them liable to a wide variety of infections, notably fungal infections. Mucormycosis (also known as zygomycosis) is a dangerous fungal infection caused by mucoromycetes, a type of mold. Here, CD4 is linked to fungal infectious disease.