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References
1. CDC. Pneumococcal Disease: Causes and How It Spreads. Access 1 Sep 2026. https://www.cdc.gov/pneumococcal/causes/index.html 2. CDC. Pneumococcal Disease Symptoms and Complications. Access 1 Sep 2026. https://www.cdc.gov/pneumococcal/about/symptoms-complications.html 3. Zhu X, et al. Virus Res. 2020;285:198005 4. Shea KM et al. Open Forum Infectious Disease. 2014;1(1):1-9. 5. CDC. Preventing Respiratory Illnesses. Access 1 Sep 2026. https://www.cdc.gov/respiratory-viruses/prevention/index.html 6. WHO (European Region). Guidance on routine immunization services during COVID-19 pandemic in the WHO European Region, 2020