Nasopharyngeal colonization by Haemophilus influenzae in children attending day-care centers, in Ribeirão Preto, State of São Paulo, Brazil - Silva, Maria E. N. Bonifácio da; Silva, Paulo da; Medeiros, Marta I. C.; Neme, Suzel N.; Macedo, Claudia; Marin, José Moacir (Brazilian Journal of Microbiology, 2006)