Alhydrogel is a range of aluminium hydroxide gel products which have been specifically developed for use as an adjuvant in human and veterinary vaccines. The gel is a suspension of boehmite-like (aluminium oxyhydroxide) hydrated nano/micron size crystals in loose aggregates. The products have a very low conductivity as a result of the proprietary production process. They have a positive charge at neutral pH and effectively adsorb negatively charged antigens. The primary purpose of the adjuvant in vaccines is to boost the antibody-mediated (Th2) immune response to the antigens. Alhydrogel products can be combined with other adjuvant types (such as monophosphoryl lipids) to achieve a balanced Th1/Th2 immune response. Alhydrogel is produced in classified clean rooms to prevent contamination, sterilised and aseptically filled in a grade A clean room.
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