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Impact of the heptavalent Pneumococcal Conjugate Vaccine (PCV7) on
the molecular determinants of macrolide resistance among invasive
isolates of Streptococcus pneumoniae in the United
States
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Impact of crowding on the antibiotic resistance of carriage isolates of Streptococcus pneumoniae from healthy Peruvian children in the pre-PCV7 period
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