Re: Patiently waiting for the results of anti-IL 6 therapy in severe COVID-19 infection

Dear Editor,
We thank Cunningham et al. [1] and Ruscitti et al. [2] for their commentary on our article [3] on the Macrophage activation syndrome (MAS)-like lung pathology in COVID-19 pneumonia. In order to clarify the classification of MAS, we proposed two types of MAS that fit along t