Zanthi fever
From Star Trek : Freedom's Wiki
A virus affecting the empathic abilities of "mature" Betazoids. It causes brief, intense headaches, during which the sufferer unconsciously projects his or her emotions onto others nearby, provided those emotions already exist in those others subconsciously. Fortunately, the sufferer is easily cured with a simple wide-spectrum antibiotic, and the effects on other people wear off in a day or two.
