RT Journal Article SR Electronic(1) A1 Ramsay, M YR 2001 T1 Meningococcal infection and the haj: surveillance and prevention JF Weekly releases (1997–2007) VO 5 IS 2 SP 1826 OP DO https://doi.org/10.2807/esw.05.02.01826-en UL https://www.eurosurveillance.org/content/10.2807/esw.05.02.01826-en