glanders vs rheum

glanders

noun
  • An infectious disease of horses, mules and donkeys caused by the bacterium Burkholderia, one species of which may be transmitted to humans. 

rheum

noun
  • Illness or disease thought to be caused by such secretions; a catarrh, a cold; rheumatism. 

  • Watery or thin discharge of serum or mucus, especially from the eyes or nose, formerly thought to cause disease. 

  • Tears. 

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