[Pictures on Epidemic Prevention] How to build a herd immunity barrier?
Editor's note: Recently, my country's first new crown vaccine has begun to vaccinate key populations in many places.
Do you want a new crown vaccine?
how to spell?
What kind of vaccine is inoculated in my country?
Who is suitable for?
Can I take off the mask after playing?
How long will the vaccination be protected?
What should I do if there is an adverse reaction?
Focusing on the new crown vaccine-related issues that the people are concerned about, Guangming Science has planned a series of popular science animations of "Pictures Saying Epidemic Prevention·The Vaccine Is Coming" to sort out and answer them.
How to form herd immunity in the population through vaccination?
The infectivity of different infectious diseases is different, and the level of immunity of people who block the epidemic of infectious diseases is also different.
Generally speaking, the stronger the infectious power of an infectious disease, the higher the immunity of the population is required.
For example, measles and whooping cough are highly infectious. If they are to be blocked, the population’s immunity must reach 90%-95%. To eliminate smallpox and poliomyelitis, the population’s immunity must reach more than 80%.
When the population’s immunity reaches the above threshold, an immune barrier is established to block the spread of measles, whooping cough, smallpox, and polio.
The immunity of the population is proportional to the protective efficacy of the vaccine and the vaccination rate.
Therefore, to achieve sufficient population immunity, it is necessary to have a sufficiently high vaccination rate, that is, most people are vaccinated.
Conversely, if there are more people who do not vaccinate or most people are unwilling to vaccinate, a strong immune barrier will not be formed, and the spread of diseases will easily occur when there is a source of infection.
Produced by: Guangmingwang Science Popularization Division
Producer: Zhan Zhao
Planning: Song Yajuan
Production: Tu Ziyi
Source: China CDC
State Council Joint Prevention and Control Mechanism Press Conference
New Coronavirus Vaccine Series Popular Science Animation