Pneumococcal vaccine is prepared from
Correct Answer: Capsular polysaccharide
Description: Pneumococcal vaccine: A polyvalent polysaccharide vaccine representing the capsular antigens of the 23 most prevalent serotypes have been stated to give 80-90% protection. Given in patients with enhanced risk of pneumococcal infection, absent or dysfunctional spleen, sickle cell disease, immunodeficiency etc. It is not recommended in children under the age of two years and those with lymphoreticular malignancies and immunosuppressive therapy A 7 valent conjugate vaccine (conjugated to the CRM197 protein of C.diptheriae) is now available which can be used in children from two months to two years. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 228
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