AIDS vs chlamydia

AIDS

noun
  • Acquired immune deficiency syndrome. 

adj
  • Extremely annoying or frustrating. 

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. 

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