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Institut Pasteur is a French public research institution which specializes in microbiology and immunology. It was founded in 1887 by Louis Pasteur, a French chemist and microbiologist. The institution is headquartered in Paris and has a presence in more than 30 countries. Françoise Barré-Sinoussi is a French virologist who co-discovered HIV, the virus that causes AIDS. She was a researcher at Institut Pasteur when she made the discovery.