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Complete absence of C7 was also found in one sibling who had the clinical syndrome of meningococcal meningitis and arthritis as a child and in this siblings clinically well eight - year - old son .
 Complete absence of C7, meningococcal meningitis, arthritis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Complete absence of C7, meningococcal meningitis, arthritis