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U.S. Department of Health and Human Services


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VAQTA Hepatitis A Vaccine, Inactivated

Audience: Healthcare professionals

Merck & Co., Inc. is voluntarily recalling specified lots of VAQTA in prefilled syringes. Re-tests have revealed a decreased antigen content in some syringes below the established minimum specification. Patients who may have received doses from the indicated lots would have been vaccinated after May 29, 2001 with the adult formulation (50U/1 mL), and after August 9, 1999 with the pediatric/adolescent formulation, (25U/0.5 mL). Guidelines for antibody testing and revaccination of these patients are offered. See the "Dear Healthcare Professional" letter below for details.

[Dec 21, 2001 - Letter - Merck & Co., Inc.]