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Streptococcus pneumoniae Adele Ricciardi
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Pneumonia - inflammatory condition of the lung PNEUMONIA CAN BE CAUSED BY: VIRUSES FUNGI BACTERIA
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Symptoms Diagnosis cough (often produces rust colored mucus) fever and chills shortness of breath chest pain fatigue Chest x-ray (in hospitals and clinics) Blood test Sputum culture physical examination CT scan
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CHEST X-RAY
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Streptococcus pneumoniae nasopharynx of healthy people Gram-positive bacteria Paired (diplococci) or appear in chains May also infect brain (pneumococcal meningitis) and blood stream (pneumococcus septicemia) Scanning Electron Micrograph of Streptococcus pneumoniae. Source: CDC/ R. Facklam, J. Carr
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S. pneumoniae was first isolated in 1881, S. pneumoniae was first isolated in 1881, but it still remains the number 1 killer of children under 5 today. but it still remains the number 1 killer of children under 5 today
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The Toll 4 million deaths every year half of these deaths - children under age 5 5,500 children die from pneumonia every day 98% of children who die of pneumonia live in developing countries contributes to the cycle of poverty
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S. Pneumoniae -Virulence Polysaccharide capsule, > 90 serotypes Resistance to phagocytosis and antibiotics
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Different serotypes
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Pneumococci in intimate contact with lung cells show reduced capsular polysaccharide
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Virulence- Pneumolysin Toxin Cholesterol-dependent cytolysin Cytokine synthesis Inflammatory response
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Pneumococcal conjugate vaccine Elicits antibodies against the seven most common capsular types Sero-specific Problems: Expensive Alter serotype distribution Results: Decrease nasopharyngeal colonization Reduce disease of included serotypes
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Use of pneumococcal conjugate vaccine is limited to parts of the developing world
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Pneumonia will continue to kill Unless we do something about it…
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Treatment Antibiotics, <$1/dose Amoxicillin – inhibit cell wall formation Erythromycin- inhibit protein synthesis 1 out of 5 children with pneumonia receives antibiotics
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We can protect from pneumonia
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Pneumonia suffers from scientific neglect
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They may not be excited now... but they will be. This vaccine deal could save 900,000 lives by 2015.
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References Bruyn, G.W, Zegers, B. M, R. van Furth. Mechanisms of Host Defense against Infection with Streptococcus pneumoniae. Clinical Infections Diseases 1992;14;251-62. Daniels, Briles, Mirza, Hakasson, Briles. Capsule does not block antibody binding to PspA, a surface virulence protein of Streptococcus pneumoniae. Microbial Pathogenesis. 40;2006;228-233. Alonsodevelasco, Verhuel, Verhoef, Snipe. Atreptococcus pneumoniae: Virulence Factors, Pathogenesis and Vaccines. Microbiological Reviews. Dec. 1995, 591-603. Hsieh, Lee, Shao, Chang, Huang. The Transforming Streptococcus Pneumoniae in the 21 st century. Chang Gung Med J Vo. 30 No. 2 2008;31:117-24 Hammerschmidt, Wolff, Hocke, Rosseau, Muller, Rohde. Illustration of Pneumonococcal Polysacharide Capsule during adherence and invasion of epithelial cells. Infection and Immunity. 2005; 4653-4667. Kadioglu, Weiser, Paton, Andrew. The role of streptococcus pneumoniae virulence factors in host respiratory colonization and disease. Nature. 2008;6. World Health Organization: The top 10 causes of death. October 2008. http://www.who.int/mediacentre/factsheets/fs310/en/index.html [2] Rudan I, Boschi-Pinto C, Biloglav Z, Mulholland K, Campbell H. Epidemiology and etiology of childhood pneumonia. Bull World Health Organ. 2008;86:408–16. World Health Organization. World health statistics 2009. Geneva: World Health Organization; 2008. http://www.who.int/whosis/whostat/EN_WHS09_Full.pdf Rudan I, Boschi-Pinto C, Biloglav Z, Mulholland K, Campbell H. Epidemiology and etiology of childhood pneumonia. Bull World Health Organ. 2008;86:408–16. World Health Organization. World health statistics 2006. Geneva: World Health Organization; 2006. http://www.who.int/whosis/whostat2006.pdf. World Health Organization. World health statistics 2006. Geneva: World Health Organization; 2006. http://www.who.int/whosis/whostat2006.pdf.. Rudan I, Boschi-Pinto C, Biloglav Z, Mulholland K, Campbell H. Epidemiology and etiology of childhood pneumonia. Bull World Health Organ. 2008;86:408–16. Rudan I, Tomaskovic L, Boschi-Pinto C, Campbell H. Global estimate of the incidence of clinical pneumonia among children under five years of age. Bull World Health Organ. 2004;82:895–903.
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