| differences in nasopharyngeal bacterial carriage in preschool children from different socio-economic origins. | clin microbiol infect abstract: a prospective cohort study of preschool healthy children (3-6 years old) from two distinct socio-economic settings in the brussels area, belgium, was conducted during the years 2006-2008. the objectives were to evaluate nasopharyngeal colonization by streptococcus pneumoniae, staphylococcus aureus, moraxella catarrhalis and haemophilus influenzae at the time of pcv7 vaccine introduction and to assess the socio-economic level impact on flora composition and antibio ... | 2010 | 20977542 |