Microbiology is born. Marcel M rieux joins the Institut Pasteur as assistant to Professor Emile Roux and works alongside Pasteur. Strongly influenced by Pasteur's teachings, M rieux establishes the Institut Biologique M rieux, a laboratory for medical, bacteriological and chemical analysis, and later a production laboratory. The Connaught Laboratories are created.
Industrial virology is born.
It will later be used in human medicine. The Institut M rieux forms an alliance with Institut Pasteur Production. Ownership will be equally divided between the two partners. Pasteur M rieux Connaught becomes Aventis Pasteur.