Table 1.

 Recruitment summary

Event	No
Letters sent	10 949
Replies received	1594
Responded “No”	353
Responded “Yes”	1241
“Yes” responses subsequently excluded	242*
Patients enrolled	999
Patients included in immunogenicity analysis	987†

*Reasons for exclusion were changed mind to “No”(58), recruitment to study already complete (40), out of age range (2), current antibiotic use (15), recent/planned further immunisation (17), meningococcal serogroup C vaccine naive status reported (47), medical history (17), moved out of area (1), unable to contact (43), and other (2).

†11 participants did not have history of immunisation with meningococcal serogroup C confirmed; one participant did not have blood drawn.