rabidity vs rabies

rabidity

noun
  • rabidness 

rabies

noun
  • An infectious disease caused by species of Lyssavirus that causes acute encephalitis in warm-blooded animals and people, characterised by abnormal behaviour such as biting, excitement, aggressiveness, and dementia, followed by paralysis and death. 

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