Beijerinck asserted that the virus was somewhat liquid in nature, calling it "contagium vivum fluidum" (contagious living fluid). He coined the term "virus".
Ivanowsky recognized certain microbes as a causal organism as the mosaic disease of tobacco.
Adolf Meyer was a scientist who gave the name tobacco mosaic disease after seeing dark and light spots on infected leaves of tobacco.
Louis Pasteur and Edward Jenner developed the first vaccines against viral infections.