The solanum virus is a fictitious zombie virus outlined in "The Zombie Survival Guide" by Max Brooks. In "The Zombie Survival Guide," the solanum virus is the virus that causes people to rise from the dead as zombies.
"The Zombie Survival Guide" is a tongue-in-cheek zombie survival manual that goes into great detail about surviving a fictitious zombie apocalypse. Max Brooks later set a novel titled "World War Z" in the aftermath of a zombie virus. "World War Z" was adapted to film and features Brad Pitt as the lead actor.
"Solanum" is actually the name for the genus of flowering plants that includes tomatoes and potatoes. There are several "solanum viruses" that affect these plants, but none of them concern humans except for in the domain of agriculture.