This is an excellent graphic from the laboratory of Carl June, who is a pioneer in CAR T Cell therapy at UPenn (Moore and June. Science  17 Apr 2020). One of the problems associated with CAR T Cell therapy is the resulting cytokine story often accompanying such a large infusion of immune cells. A similar problem is seen in COVID-19 patients (as well as in those infected with SARS-CoV and MERS-CoV), where it is thought to be the actual cause of death in infected patients.

Preliminary trials using drugs interfering with IL-6 signaling are showing signs of hope for severely sick COVID-19 patients.

Thank you to Michael McHeyzer-Williams (@mmw_lmw) of the Scripps Institute for his tweet pointing me toward this paper.