Epidemic Information

Notice! 16 Key Numbers to Understand COVID-19 Vaccines
• As of now, China has administered 1.3 billion doses of COVID-19 vaccines, but due to its large population base, the vaccination rate remains much lower than in countries like the UK and the US. Herd immunity is only achieved when 70–80% of the population is vaccinated. How long should the two doses of inactivated vaccines be spaced? Who should not get vaccinated? Can different COVID-19 vaccines be used interchangeably? Here’s a quick overview of 16 key data points about vaccination—save for reference!

  16 Key Numbers for COVID-19 Vaccination:

  1. 1.3 billion doses administered in China as of [date], covering ~9.2% of the population (calculated by doses per 100 people).
  2. 70–80% target: Herd immunity threshold for COVID-19, requiring 980 million–1.12 billion people vaccinated in China (based on a population of 1.4 billion).
  3. 21–28 days: Recommended interval between two doses of inactivated vaccines (e.g., Sinopharm, Sinovac).
  4. 4–8 weeks: Interval for adenovirus vector vaccines (e.g., CanSinoBIO), typically a single dose but some regimens may require two.
  5. 18+: Eligibility for most vaccines in China; trials for adolescents (12–17 years) are ongoing.
  6. 40 million+: Daily global vaccination capacity (as of mid-2021), with China contributing ~25% of daily doses.
  7. <3 days: Average time for adverse reactions (e.g., soreness, fever) to subside after vaccination.
  8. 90%+: Efficacy of mRNA vaccines (Pfizer/BioNTech, Moderna) against symptomatic infection; ~79% for Chinese inactivated vaccines.
  9. 14 days: Time required after the second dose for full protective effects to develop.
  10. Contraindications: Individuals with severe allergies, uncontrolled chronic diseases, or acute infections should not be vaccinated.
  11. 2–3 weeks: Minimum gap recommended between COVID-19 vaccines and other vaccines (e.g., flu shots).
  12. 0%: Vaccination is not recommended for pregnant women (data on safety during pregnancy is still emerging).
  13. 7 days: Wait period after recovering from COVID-19 before getting vaccinated.
  14. No: Different technical platforms (inactivated, mRNA, vector) are not interchangeable unless specified by health authorities.
  15. 2–8°C: Storage temperature for most inactivated vaccines, contrasting with mRNA vaccines requiring ultra-cold storage (-20°C to -70°C).
  16. 10 billion+: Global vaccine doses administered by end of 2021, with China accounting for ~25% of the total.
  
  
  Note: Specific guidelines may vary by region. Always consult local health authorities or your physician before vaccination.
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