（翻译）For a virus to multiply. It must first infect a cell. At the onset of infection, the virus introduces into the cell its genetic material—RNA or DNA—accompanied in many instances by essential proteins. They replicate inside specific host cells by using the biosynthetic systems of the host under the direction of the viral genomes. Bacterial viruses which infect fermentation process microbial strains have caused serious problems particularly in the cheese starter culture and the glutamic acid fermentation.
