Gilead Sciences is an American biotechnology company that discovers, develops and commercializes therapeutics. For many years since the company was founded, the company concentrated primarily on antiviral drugs to treat patients infected with HIV, hepatitis B, hepatitis C, or influenza. In 2006, Gilead acquired two companies that were developing drugs to treat patients with pulmonary diseases. The company has fourteen commercially available products. Headquartered and founded in Foster City, California, Gilead has operations in North America, Europe and Australia. As of the end of 2009, the company had approximately 4,000 full-time employees. The company's name and logo refer to the Balm of Gilead.