The Collaborative International Dictionary of English v.0.48:
HS2 \HS2\, HSV-2 \HSV-2\, HSV-II \HSV-II\n. 1. Herpes simplex 2, a herpes virus that can cause genital herpes; also called type II Herpes. Syn: herpes simplex 2. [WordNet 1.5]WordNet (r) 3.0 (2006):
HSV-2 n 1: a herpes virus that can cause genital herpes [syn: herpes simplex 2, HS2, HSV-2, HSV-II]