Indirect effect of 7-valent and 13-valent pneumococcal conjugated vaccines on pneumococcal pneumonia hospitalizations in elderly.

This indirect effect has not been seen in Scotland [ 17 ] and in UK, where the most recent study had found an increasing trend in PP hospitalizations in adults aged 65 years and more after PCV13 introduction [ 18 ], despite the reduction of PP incidence reported in the 5 following years after PCV13 introduction [ 19 ].

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