Role of anti-CK antibodies: 👉⬆️susceptibility to severe mycobacterial dz & opportunistic infx (similar to HIV) 👉causes an indeterminate quantiferon (no response to mitogen) 👉initiated by infx➡️anti-Noc2 Ab➡️cross react with IFN➡️IFN-Ab 👉⬆️severity of #COVID19 #ACR21 1/2 https://t.co/5NHQpwQw6X