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We studied the molecular basis of C9 deficiency in four Japanese C9 - deficient patients who had suffered from meningococcal meningitis .
 Disease: C9 deficiency; Disease: C9 - deficient; Disease: meningococcal meningitis
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: C9 deficiency; Disease: C9 - deficient; Disease: meningococcal meningitis