RT Journal Article SR Electronic T1 Valacyclovir reduced genital herpes transmission in couples discordant for herpes simplex virus type 2 infection JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 146 OP 146 DO 10.1136/ebm.9.5.146 VO 9 IS 5 YR 2004 UL http://ebm.bmj.com/content/9/5/146.abstract AB