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He is regarded as one of the three main founders of bacteriology , together with Ferdinand Cohn and Robert Koch , and is popularly known as the " father of microbiology " .
 Ferdinand Cohn, Robert Koch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ferdinand Cohn, Robert Koch