37
Her fresh serum lacked complement - mediated bactericidal activity against Neisseria gonorrhoeae , but the addition of fresh normal serum or purified C7 restored bactericidal activity as well as hemolytic activity .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None