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Carriage rate and effects of vaccination after outbreaks of serogroup C meningococcal disease, Brazil, 2010.

Sáfadi, Marco Aurelio Palazzi; Carvalhanas, Telma Regina Marques Pinto; Paula de Lemos, Ana; Gorla, Maria Cecilia Outeiro; Salgado, Maristela; Fukasawa, Lucila O; Gonçalves, Maria Gisele; Higa, Fabio; Brandileone, Maria Cristina Cunto; Sacchi, Claudio Tavares; Ribeiro, Ana Freitas; Sato, Helena Keico; Bricks, Lucia Ferro; Cassio de Moraes, José.
Emerg Infect Dis; 20(5): 806-11, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24751156
During 2010, outbreaks of serogroup C meningococcal (MenC) disease occurred in 2 oil refineries in São Paulo State, Brazil, leading to mass vaccination of employees at 1 refinery with a meningococcal polysaccharide A/C vaccine. A cross-sectional study was conducted to assess the prevalence of meningococci carriage among workers at both refineries and to investigate the effect of vaccination on and the risk factors for pharyngeal carriage of meningococci. Among the vaccinated and nonvaccinated workers, rates of overall meningococci carriage (21.4% and 21.6%, respectively) and of MenC carriage (6.3% and 4.9%, respectively) were similar. However, a MenC strain belonging to the sequence type103 complex predominated and was responsible for the increased incidence of meningococcal disease in Brazil. A low education level was associated with higher risk of meningococci carriage. Polysaccharide vaccination did not affect carriage or interrupt transmission of the epidemic strain. These findings will help inform future vaccination strategies.