Table 1.

Diagnostic tests.

Infections
Urine cultures	Negative
Blood cultures	Negative
Pericardial fluid	Negative
HCV, HBV, HSV, VZV, CMV, HHV-6, EBV, parvovirus B19, adenovirus, Coxsackie virus, HTLV1–2	Negative
Toxoplasmosis, Toxocara spp., Entamoeba histolytica, Strongyloides stercoralis; parasitological stool test	Negative
Immunology
Total IgE	60 KU/l (n.v. 0–87)
Total IgA	1.15 g/dl (n.v. 0.80–5.30)
Total Ig M	2.38 g/dl (n.v.0.50–2.00)
IgG4	270,7 mg/l (n.v. 39,2-864,0)
Complement C3	1.10 g/dl (n.v.0.79–1.52)
Complement C4	0.13 g/dl (n.v. 0.16–0.38)
Autoimmunity
c-ANCA; p-ANCA, ANA, AMA, ENA, nDNA-Ab	Negative
Coronavirus
SARS-CoV2 PCR testing	Negative
RBD–SARS–CoV2 Ab	Positive (28,925 U/ml)
Total SARS-CoV2-Ab	Positive
Hematology
BCR/ABL, PDGFR/TEL; FIPIL1/PDGFRA	Negative

HCV, hepatitis C virus; HBV, hepatitis B virus; HSV, herpes simplex virus; VZV, varicella-zoster virus; HHV-6, human herpesvirus 6; EBV, Epstein-Barr virus; HTLV 1–2, human T-lymphotropic virus type 1–2; IgE, immunoglobulin E; IgA, immunoglobulin A; IgM, immunoglobulin M; IgG4, immunoglobulin G4; c-ANCA, p-ANCA, anti-neutrophil cytoplasmic antibodies targeting proteinase 3 and myeloperoxidase respectively; ANA, anti-nuclear antibody; AMA, anti-mitochondrial antibody; ENA, extractable nuclear antigen; nDNA-Ab, anti-native DNA antibody; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; RBD-SARS-CoV-2 Ab, anti-SARS-CoV-2 spike protein receptor binding domain. BCR/ABL, PDGFR/TEL; FIPL1/PDGFRA gene transcripts.