40396
His unpalatable observational evidence was only accepted when seemingly unrelated work by Louis Pasteur in Paris some two decades later offered a theoretical explanation for Semmelweis 's observations : the germ theory of disease .
 Louis Pasteur, 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:
 Louis Pasteur, Semmelweis