- Murray Medical Microbiology, virology overview and medically important viruses.
- Jawetz, Melnick & Adelberg's Medical Microbiology, viral classification chapters.
- CDC Pink Book: Principles of Vaccination.
- CDC Pink Book: Hepatitis B.
- CDC: Staying Up to Date with COVID-19 Vaccines, page updated 2025-11-20.
- CDC: COVID-19 Treatment Clinical Care for Outpatients.
- WHO: Tracking SARS-CoV-2 variants, content updated 2026-02-23.
- 衛福部疾管署:新冠併發重症 與 COVID-19 疫苗接種計畫.