A good luck virus anyone?

Watch out for Horizon on BBC2 tonight (Wednesday) at 9pm. It's all about viruses, specifically H1N1 and why some of them turn into killers - makes a great follow-up to remake of apocalyptic TV series Survivors on TV last night! One wonders if they'll also consider any 'good' viruses. Who can forget the superb Red Dwarf episode that postulated that positive viruses might exist, such as the 'good luck' virus. Now a pandemic of that virus would make a nice change!