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Pneumococcal Vaccine Linked with Increased Risk of Multiresistant Strain

Infants who received heptavalent pneumococcal conjugate vaccination at 2, 4, and 11 months were more likely to have pneumococcal serotype 19A in their nasal passages. This is a leading cause of respiratory pneumococcal disease.

Pneumococcal serotype 19A strains are often multiresistant to antibiotics. The incidence of such strains has increased over the last decade.

Science Daily reports:

“In the United States, serotype 19A is now the leading causative pneumococcal serotype of invasive and respiratory pneumococcal disease and the most frequently observed serotype in nasopharyngeal carriage. In the United States and other countries, the increase in serotype 19A disease was associated in time with the widespread implementation of PCV-7 in routine infant immunization programs”.

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