Pneumococcal infection of the lung.
D002675:Child, Preschool; D006801:Humans; D007251:Influenza, Human / Q000150:complications; D009975:Orthomyxoviridae / Q000276:immunology; D011018:Pneumonia, Pneumococcal / Q000150:complications / Q000401:mortality* / Q000517:prevention & control; D013296:Streptococcus pneumoniae / Q000276:immunology; D014611:Vaccination / Q000379:methods