4166
Hereditary deficiency of the seventh component of complement and recurrent meningococcal infection : investigations of an Irish family using a novel haemolytic screening assay for complement activity and C7 M / N allotyping .
 deficiency of the seventh component of complement, meningococcal infection
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 deficiency of the seventh component of complement, meningococcal infection