The first virus discovered and termed a “virus” was isolated from infected tobacco plants and named Tobacco mosaic virus (TMV). It was the first microbe recognized and described in 1898 as a virus (contagium vivum fluidum) by Martinus Beijerinck, a microbiologist at Delft University in The Netherlands. Earlier, Dimitry Ivanowsky also worked on figuring out the causal agent of mosaic disease on tobacco but is generally not credited with discovering what the entity was, but rather with the observation that it was not a bacterium.