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Cumulative proportion of response to additional doses of hepatitis B virus (HBV) vaccine among human immunodeficiency virus type 1 (HIV-1)–infected participants. Plot showing the cumulative proportion with immune response to additional doses of standard HBV vaccine among HIV-1–infected participants. Immune response was determined 6 months after completion of the initial vaccination series and 4 weeks after the first and third revaccination doses.
