In a study conducted by several Indian research institutes, the zinc levels of 47 Covid-19 patients were compared with the zinc levels of 45 healthy people (control group). The results showed that a significant number of the involved Covid-19 patients (57,4%) had a zinc deficiency compared to the control group. These patients developed more complications, which were associated with a prolonged hospital stay and increased mortality. More details can be found in the study.
Jothimani et al.