Can someone explain the dearth of research looking out how zinc deficiency might explain variations in outcome after SARS-CoV-2 infection? Both ADAM17, which h

Can someone explain the dearth of research looking out how zinc deficiency might explain variations in outcome after SARS-CoV-2 infection? Both ADAM17, which helps ACE2 shed from the cell, and ACE2 itself, are zinc finger proteins and use zinc as a cofactor.