RTX product label lists Serum Sickness (SS) as uncommon postmarketing AE. Study of 37 pts w/ RTX SS finds that 3/4 occurred in SLE & autoimmune dz; 1st inf54% during 1st injxn, usually w/in 12 days. Manifest as MSK sx (92%), fever (87%), skin lesions(78%) https://t.co/gc8CUXhqxL