High IFN-α levels were found in patient’s serum, and ... High IFN-α levels were found in patient’s serum, and correlated well with disease activity measured by SLEDAI score. *Fever, pulmonary infiltrates, rash, arthritis, mucosal ulcers. **Fever, rash, cutaneous vasculitis, arthritis, leukopaenia. Arrow: fresh frozen plasma infusion. Dashed arrow: Time point of appearance of C1q antibodies (19 U/ml, reference <14). The C1q antibody titre subsequently increased to >100 U/ml. Unless provided in the caption above, the following copyright applies to the content of this slide: © The Author(s) 2019. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For permissions, please email: journals.permissions@oup.comThis article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) Rheumatology (Oxford), Volume 58, Issue 5, 03 January 2019, Pages 918–919, https://doi.org/10.1093/rheumatology/key419 The content of this slide may be subject to copyright: please see the slide notes for details.