genital herpes vs herpes simplex

genital herpes

noun
  • A genital infection caused by herpes simplex viruses (mostly HHV2 but also HHV1). 

herpes simplex

noun
  • A viral disease caused by Human herpesvirus 1 or Human herpesvirus 2 in genus Simplexvirus. 

How often have the words genital herpes and herpes simplex occurred in a corpus of books? (source: Google Ngram Viewer )