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“Background Streptococcus pneumoniae is a major cause of serious community-acquired diseases

(such as pneumonia, bacteremia or meningitis), especially in children, the elderly, and among patients with immunological disorders [1]. very Nasopharyngeal colonization by S. pneumoniae is highly common, particularly among children attending day-care centers and in adults in long-term institutions [2]. Pneumococci are presently divided into 91 serotypes, which are defined by differences in their polysaccharide capsule [3, 4]. Two serotype-based vaccines are currently available: the 23-valent polysaccharide vaccine (23V-PSV) which has been shown to be effective in the elderly [5–7], and the heptavalent pneumococcal conjugate vaccine (PCV7) which is used in children below the age of two [5]. In the USA the introduction of PCV7 in children was associated with a decrease in the incidence of invasive pneumococcal diseases (IPD) among children and adults [8].

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