Chiron Corporation was a multinational biotechnology firm based in Emeryville, California that was acquired by Novartis International AG on April 20 2006. It had offices and facilities in eighteen countries on five continents. Chiron's business and research was in three main areas: biopharmaceuticals, vaccines and blood testing. Chiron's vaccines and blood testing units have been combined to form Novartis Vaccines and Diagnostics, while Chiron BioPharmaceuticals will be integrated into Novartis Pharmaceuticals.