The human polyomavirus, JCV, uses serotonin receptors to infect cells.
Elphick GF, Querbes W, Jordan JA, Gee GV, Eash S, Manley K, Dugan A, Stanifer M, Bhatnagar A, Kroeze WK, Roth BL, Atwood WJ. The human polyomavirus, JCV, uses serotonin receptors to infect cells. Science. 2004 Nov 19; 306(5700):1380-3.