Acquisition of W135 meningococcal carriage in Hajj pilgrims and transmission to household contacts: prospective study

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Abstract
We conducted a prospective study of meningococcal carriage in Singaporean pilgrims before the Hajj 2001 and in pilgrims and their household contacts two weeks after return from the Hajj. We performed serogrouping and pulsed field gel electrophoresis on meningococcal isolates to determine the predominant serogroup and relatedness of the strains. We questioned participants about the occurrence of any symptoms of upper respiratory tract infection, use of antibiotics within the past month, and number of people in the household.

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