Martinus Willem Beijerinck (Dutch pronunciation: [mɑrˈtinʏs ˈʋɪləm ˈbɛiərɪŋk], 16 March 1851 – 1 January 1931) was a Dutch microbiologist and botanist who was one of the founders of virology and environmental microbiology. He is credited with the co-discovery of viruses (1898), which he called "contagium vivum fluidum".
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