144549
Dr. Ignaz Semmelweis discovered in 1847 that hand-washing with a solution of chlorinated lime reduced the incidence of fatal childbed fever tenfold in maternity institutions .
 Ignaz Semmelweis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ignaz Semmelweis