Rabies Post-Exposure Prophylaxis for Previously Vaccinated Persons

Introduction to Rabies Prophylaxis

• The Centers for Disease Control and Prevention (CDC) recommends that previously vaccinated persons receive only 2 doses of rabies vaccine (on days 0 and 3) and do not need rabies immune globulin (HRIG) 1, 2, 3

The Simplified Regimen for Previously Vaccinated Individuals

• The Advisory Committee on Immunization Practices (ACIP) guidelines indicate that previously vaccinated persons require a significantly reduced regimen compared to those never vaccinated, with a 2-dose regimen consisting of 1.0 mL administered intramuscularly in the deltoid muscle on days 0 and 3 1, 2, 4, 7, 8
• The ACIP definition of "previously vaccinated" includes anyone who received a complete ACIP-recommended pre-exposure or post-exposure prophylaxis regimen with cell-culture vaccines, regardless of how long ago the vaccination occurred 1, 4, 5

Critical Caveats and Pitfalls

• Immunocompromised individuals should receive the full 5-dose vaccine regimen (days 0, 3, 7, 14, and 28) and one dose of HRIG at 20 IU/kg body weight, as well as serologic testing to confirm adequate antibody response 1, 2, 3, 9, 10
• Conditions causing immunosuppression include corticosteroid use, other immunosuppressive medications, antimalarials, HIV/AIDS, and other immunosuppressive illnesses 1, 2

Administration and Timing

• Vaccine must be administered in the deltoid muscle for adults (or anterolateral thigh for young children)—never in the gluteal area, as this produces inadequate antibody responses 4, 7
• Initiate post-exposure prophylaxis (PEP) as soon as possible after exposure, with treatment remaining indicated regardless of time elapsed since exposure 1, 7

Serologic Testing

• For healthy, immunocompetent previously vaccinated persons, routine serologic testing after completing the 2-dose booster is not necessary, as the immune system will mount an adequate response based on immunologic memory 1, 7