chlamydia vs herpes

chlamydia

noun
  • Any of several common, often asymptomatic, sexually transmitted diseases caused by the microorganism Chlamydia trachomatis. 

  • Any of various coccoid microorganisms of the genus Chlamydia that are pathogenic to humans and other animals. 

herpes

noun
  • A viral infection, caused by Human alphaherpesvirus 1 and Human alphaherpesvirus 2, marked by painful, watery blisters in the skin or mucous membranes or on the genitals. 

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