Decline in pneumonia admissions after routine childhood immunisation with pneumococcal conjugate vaccine in the USA: a time-series analysis.

By Carlos G. Grijalva, J. Nuorti, P. Arbogast, S. Martin, Marie R. Griffin. The Lancet, 2007

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Guidelines for the management of adult lower respiratory tract infections - Full version (2011, neutral): “Concerning other outcomes, the herd effect is less clear, with one study indicating a decrease of all-cause pneumonia and pneumococcal pneumonia in adults 18–39 years of age [536], while another showed no impact at all for all-cause pneumonia in adults [537].”
Sustained reductions in invasive pneumococcal disease in the era of conjugate vaccine. (2010, result): “Our data complement the findings of recent studies documenting reductions in meningitis [21], noninvasive pneumonia [22], otitis media [23, 24], and pneumococcal infections resistant to antibiotics [25] after PCV7 introduction.”