contagious vs pathogenic

contagious

adj
  • Having a disease that can be transmitted to another person. 

  • Easily transmitted to others. 

  • Easily passed on to others. 

pathogenic

adj
  • Able to cause (harmful) disease. 

  • Consisting of harsh, percussive, nonverbal sounds. 

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