A virus which affects the empathic abilities of older betazoids, causing them to project their own emotions onto others in close proximity during such an attack -- manifested as a passing headache. The emotion only took hold in subjects where a latent propensity in that direction was present; a simple wide-spectrum anti-viral agent is enough to cure it; the effect on others fades in a day or two.Lwaxana's case aboard Deep Space Nine during the Gratitude Festival sends Jake chasing Major Kira, her Bareil lusting for Science Officer Dax, who in turn wanted Commander Sisko; later, Doctor Bashir and Major Kira coupled up and even Quark went for Keiko. Ironically, Chief O'Brien proved immune to it, as did Constable Odo.