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  • Print publication year: 2006
  • Online publication date: August 2009

5 - Phagocytosis of Streptococcus pneumoniae



Streptococcus pneumoniae is a major cause of morbidity and mortality worldwide, and commonly colonizes the upper respiratory tract. In some colonized individuals the organism translocates to other tissues and causes life-threatening diseases including pneumonia, bacteremia, and meningitis. Rates of disease are especially high in the very young and old and in patients with predisposing conditions including HIV infection, cardiopulmonary or co-morbidities, renal diseases including nephrotic syndrome, and sickle cell disease and other causes of hyposplenia.

Approximately 5 million children under the age of 5 years die with a respiratory tract infection every year; the major causative pathogen in these cases is S. pneumoniae (Williams et al. 2002). Pneumococcal infection caused approximately 45,000 deaths in adults in the United States in 1998, about two years prior to the introduction of the 7-valent pneumococcal conjugate vaccine for infants (Robinson et al. 2001). Streptococcus pneumoniae also causes less serious but extremely common diseases such as otitis media, sinusitis and exacerbations of chronic obstructive pulmonary disease. It has been estimated that there are 7 million cases of otitis media in the United States every year (Stool & Field 1989).


Nasopharyngeal carriage

The first step in the pathogenesis of pneumococcal disease is nasopharyngeal colonization, with individuals often carrying more than one serotype at a time. Asymptomatic nasopharyngeal carriage is established when surface components of the pneumococcus bind to nasal epithelium (Tuomanen & Masure 1997; Weiser et al., 1996).

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Phagocytosis of Bacteria and Bacterial Pathogenicity
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