AstraZeneca plc is a British-Swedish multinational pharmaceutical and biotechnology company with its headquarters at the Cambridge Biomedical Campus in Cambridge, England. It has a portfolio of products for major diseases in areas including oncology, cardiovascular, gastrointestinal, infection, neuroscience, respiratory, and inflammation. It was involved in developing the Oxford–AstraZeneca COVID-19 vaccine. The company was founded in 1999 through the merger of the Swedish Astra AB and the British Zeneca Group. Since the merger it has been among the world's largest pharmaceutical companies and has made numerous corporate acquisitions, including Cambridge Antibody Technology, MedImmune, Spirogen and Definiens. It has its research and development concentrated in three strategic centres: Cambridge, England; Gothenburg, Sweden and Gaithersburg in Maryland, U.S. AstraZeneca traces its earliest corporate history to 1913, when Astra AB was formed by a large group of doctors and apothecaries in Södertälje. Throughout the twentieth century, it grew into the largest pharmaceutical company in Sweden. Wikipedia