title: Erratum.
abstract: In Thomas H. Maugh II's Research News article "New agents active against herpesviruses" (15 Apr., p. 292), Raymond Shinazi was in correctily reported to have found that 2'-fluoro-5-iodoarabinosylcytosine (FIAC) is "the most potent and effective drug known to date" against herpes encephalitis in mice. Shinazi found that 2'-fluoro-5-methylarabinosyluracil (FMAU) is the most effective drug against this disease.