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Difterivaccin SSI (also known as Difterivaccine SSI) is a monovalent diphtheria toxoid vaccine originally developed and manufactured by the Statens Serum Institut (SSI), a Danish public health institution, and later produced by AJ Vaccines. It contains purified diphtheria toxoid adsorbed to aluminum hydroxide as an adjuvant. The vaccine is indicated for active immunization (both primary vaccination and booster/revaccination) against diphtheria in children and adults. In clinical research, Difterivaccin SSI has been evaluated in Phase 4 trials (such as those sponsored by Örebro Läns Landsting in Sweden) to study re-immunization strategies and protective antibody levels in patients who have lost vaccine-acquired immunity following autologous or allogeneic hematopoietic stem cell transplantation.
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