12 July 2023
: Case report 
Parvovirus B19 Infection: A Vasculitis Masquerade in an Elderly Patient
Unusual clinical course, Mistake in diagnosis, Diagnostic / therapeutic accidents, Unusual setting of medical care, Educational Purpose (only if useful for a systematic review or synthesis)
Morika Suzuki1ABCDEFG, Takashi Watari
23ABCDEFG*
DOI: 10.12659/AJCR.939696
Am J Case Rep 2023; 24:e939696
Table 2. Laboratory test results.
| WBC | 10 100 | /μL | STS | (-) | |||
| RBC | 438 | ×10/μL | TPHA | (-) | |||
| Hb | 12.9 | g/dL | HBsAg, HBsAb | (-) | |||
| Plt | 36.9 | ×10/μL | HCV | (-) | |||
| ESR | 55 | mm/h | HIV | (-) | |||
| TP | 6.7 | g/dL | CMV-IgM | (-) | |||
| Alb | 3 | g/dL | EBV-IgM | (-) | |||
| AST | 54 | IU/L | T-SPOT | (-) | |||
| ALT | 34 | IU/L | Mycoplasma-IgM | (-) | |||
| LDH | 310 | IU/L | SARS-CoV-2 PCR | (-) | |||
| BUN | 25 | mg/dL | B19V-IgM | 4.76 | Index | <0.8 | |
| Cr | 1.19 | mg/dL | |||||
| Na | 138 | mEq/L | ANA | 640 | fold | <40 | |
| K | 4.3 | mEq/L | MPO-ANCA | <1.0 | U/mL | 0–3.4 | |
| Cl | 101 | mEq/L | PR3-ANCA | 0.8 | <2.0 | ||
| C3 | 116 | mg/dL | 73–138 | Anti-SS-A/Ro | <0.5 | U/mL | <7.0 |
| C4 | 16 | mg/dL | 11–31 | Anti-ds-DNA | 1.9 | IU/mL | 0–12 |
| IgG | 1607 | mg/dL | 861–1747 | Anti-Sm Ab | 0.6 | U/mL | <7.0 |
| IgA | 201 | mg/dL | 93–393 | Anti-RNP Ab | 0.6 | U/mL | <3.5 |
| IgM | 168 | mg/dL | 33–183 | Lupus anticoagulant | 0.8 | <1.3 | |
| CRP | 11.3 | mg/dL | <0.3 | aCL | 13 | U/mL | 0–10 |
| sIL-2R | 1543 | U/mL | 333–587 | Cryoglobulin | (-) | ||
| aCL – anticardiolipin; Alb – albumin; ALT – alanine aminotransferase; ALP – alkaline phosphatase; ANA – antinuclear antibody; ANCA – antineutrophil cytoplasmic antibody; AST – aspartate aminotransferase; B19V – human parvovirus B19; BUN – blood urea nitrogen; Cl – chlorine; Cr – creatinine; CMV – cytomegalovirus; CRP – C-reactive protein; ds – double-stranded; EBV – Epstein-Barr virus; ESR – erythrocyte sedimentation rate; Glu – glutamic acid; Hb – hemoglobin; HbsAg – surface antigen of the hepatitis B virus; HbsAb – hepatitis B surface antibody; HCV – hepatitis C virus; HIV – human immunodeficiency virus; Ig – immunoglobin; K – potassium; LDH – lactate dehydrogenase; LDL-Chol – low-density lipoprotein cholesterol; MPO – myeloperoxidase; Na – sodium; PCR – polymerase chain reaction; Plt – platelet count; PTH – parathyroid hormone; PR3 – serum anti-proteinase 3; RBC – red blood cells; RNP – ribonucleoprotein; SARS-CoV-2 – severe acute respiratory syndrome coronavirus 2; STS – syphilis; TP – total protein; TPHA – treponema pallidum hemagglutination assay; WBC – white blood cells. | |||||||