Social & Preventive Medicine General d8002bb6 Adjuvant used in DPT vaccine is: A Aluminium phosphate B Silica C Magnesium hydroxide D Manganese hydroxide High-Yield Explanation Adjuvant used in DPT vaccine is aluminium phosphate or hydroxide. Use of adjuvant increases immunological effectiveness of DPT vaccine. Ref: Park 21st edition, page 151.