Before infusion
TB, infections, VZV
VARICELLA ZOSTER, VIRUS, HEPATITIS B, INFECTIONS
Participants will be selected based on strict inclusion and exclusion criteria. Additionally, we will carry out tests for TB, HIV, varicella zoster virus (VZV) antibody and Hepatitis B and C because, though unlikely after a single dose, tocilizumab could make these infections worse. Female participants of childbearing age will be given a pregnancy test, which must be negative. Participants who are sexually active will be asked to use at least one form of effective contraception for 6 weeks post infusion. Male participants will also be asked not to donate sperm samples for 6 weeks post infusion.