Fig. 1
From: Association between fatality rate of COVID-19 and selenium deficiency in China
The case fatality rate of COVID-19 and selenium deficiency at the city level based on selenium content in crops (Panel a) and topsoil (Panel b) in the mainland of China. The background color of the map represents the selenium level at the city level. The dots display the average fatality rate of COVID-19 at the city level. The average fatality rate was only shown for cities reporting least one death. The fatality rate of cities with < 20 deaths are indicated in brackets