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. 2011 Jan;17(1):79–82. doi: 10.3201/eid1701.100750

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Parvovirus 4 (PARV4) enzyme immunoassay (EIA) results, Finland. Red dots, immunoglobulin (Ig) M; ×, IgG. Upper dashed line indicates IgM cutoff value (0.205), and lower dashed line indicates IgG cutoff value (0.141). A) Group 1: 115 university students (1 serum sample/person); none positive for PARV4 IgG, and 1 positive for PARV4 IgM. B) Group 2: 78 HIV-infected injection drug users (151 serum samples [1–7 samples/person]). Prevalences of PARV4 IgG and IgM were 78.2% (61/78) and 5.1% (4/78), respectively. C) Group 3: 200 hepatitis C virus–infected patients (1 sample/person). Prevalences of PARV4 IgG and IgM were 34.5% (69/200) and 1.5% (3/200), respectively.