Pneumococcus: Questions and Answers

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There are two types of pneumococcal vaccine – pneu-mococcal polysaccharide vaccine and pneumococcal conjugate vaccine. The first pneumococcal polysaccharide vaccine, con-taining 14 serotypes, was licensed in the United States in 1977. In 1983, an improved pneumococcal polysac-charide vaccine (Pneumovax, Merck) was licensed,

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