infection vs malady

infection

noun
  • A disease caused by a pathogen. 

  • The act or process of infecting. 

  • An uncontrolled growth of harmful microorganisms in a host. 

  • A visible sign of such a disease, such as the suppuration of a wound. 

malady

noun
  • Any ailment or disease of the body; especially, a lingering or deep-seated disorder. 

  • A moral or mental defect or disorder. 

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