Immune responses that are indicative of protection have been established for both Hib and meningococcal C disease [Andrews et al., 2003; Kayhty et al., 1983]. It is therefore proposed that the immune responses of those laboratory staff taking part be measured as data currently available following Menitorix vaccination is in naïve children and adults [Tejedor et al., 2006a and b; Carmona et al., 2006; Habermehl et al., 2006; Pace et al., 2006]. This study will also allow us to provide occupational healthcare to laboratory workers.