No cases had positive antiphospholipid antibodies, anti-La/SSB, or anti-β-glycoprotein I antibodies, nor positive serologies for Epstein–Barr, Parvovirus B19, cytomegalovirus (CMV), HIV, viral hepatitis B and C, herpes zoster, measles, or toxoplasma. Here, SSB is linked to hepatitis B virus infection.