Vaccines contribute to pediatric pneumonia prevention by protecting against specific pathogens. Which pathogens are commonly targeted to reduce pneumonia incidence in children?

• A. Streptococcus pneumoniae and Haemophilus influenzae type b.
• B. Staphylococcus aureus and Pseudomonas aeruginosa.
• C. Mycobacterium tuberculosis and Nontypeable Haemophilus influenzae.
• D. Influenza virus only.

Answer: (A)

Vaccination reduces pediatric pneumonia mainly by targeting the two bacteria most commonly responsible for bacterial pneumonia in children: Streptococcus pneumoniae and Haemophilus influenzae type b. The pneumococcal conjugate vaccines (PCV) teach the immune system to recognize the capsule of S. pneumoniae, lowering nasopharyngeal carriage, transmission, and invasive disease, which translates into fewer pneumonia cases and hospitalizations. The Hib vaccine protects against Haemophilus influenzae type b, reducing Hib pneumonia as well as other Hib diseases. Together, these vaccines have a substantial impact on pneumonia burden in childhood.

Other options either point to pathogens that are not the primary vaccine-targeted causes of pediatric pneumonia on a population level, or involve a virus where vaccination reduces pneumonia indirectly (for example, by preventing influenza and thus secondary bacterial pneumonia), but the most direct and widely protective vaccine targets for reducing pneumonia incidence are Streptococcus pneumoniae and Haemophilus influenzae type b.