Neisseria meningitidis disease-associated clones in Amazonas State, Brazil.

Background: The aim of this study is to describe the molecular epidemiology of Neisseria meningitidis invasive disease before the introduction of serogroup C conjugate vaccine in Amazonas State in 2010.

Methods: Meningococcal disease reported cases were investigated in Amazonas State during the period 2000-2010. N.