2390
They had been taking metronidazole ( total dosage , 45 - 120 g ; duration , 30 days to 2 months ) to treat the infection in various organs .
 metronidazole, infection
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 metronidazole, infection