Slayer vocalist Tom Araya has updated fans on the health of the band's guitarist Jeff Hanneman.Jeff was admitted to hospital earlier this year after contracting necrotising fasciitis on his right arm following a suspected spider bite.Chatting to SVT prior to Slayer's recent show in Sweden, Tom told reporters: "Jeff was seriously ill.""Jeff ended up contracting a bacteria that ate away his flesh on his arm, so they cut open his arm, from his wrist to his shoulder, and they did a skin graft on him, they cleaned up," says the frontman. "It was a flesh-eating virus, so he was really, really bad. So we'll wait for him to get better, and when he's a hundred percent, he's gonna come out and join us."Exodus member Gary Holt is filling in for Jeff until he is fully recovered.Slayer will play the UK Sonisphere Festival this coming weekend.