 Ivanovsky suggested the infection might be caused by a toxin produced by bacteria, but did not pursue the idea.In 1898, the Dutch microbiologist Martinus Beijerinck (1851–1931), a microbiology teacher at the Agricultural School in Wageningen repeated experiments by Adolf Mayer and became convinced that filtrate contained a new form of infectious agent.He observed that the agent multiplied only in cells that were dividing and he called it a "contagium vivum fluidum" (soluble living germ) and re-introduced the word "virus".