Even though there is a clear trend to decreased fatality, several factors, such as inadequate disease registration and suboptimal microbiological identification could have affected pneumococcal strains isolation and lack of PCV7 serotypes decline.
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Invasive pneumococcal disease in hospitalised children from Lima, Peru before and after introduction of the 7-valent conjugated vaccine.
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The sentences
Even though this is non-conclusive, we consider it shows an important trend that needs to be followed.