Why did the neighborhood Committee urge you to get a booster shot?

Why does the neighborhood committee urge you to take the vaccination as follows:

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2. Why are you urged to get COVID-19 vaccine? 2. Maintain regional security. Although the principle of vaccination in China is voluntary and informed, some neighborhood committees will urge you to get COVID-19 vaccine, mainly because of the overall safety of your community. Only one community is safe, one region will be safe, all regions will be safe, and the whole city will establish an immune barrier, so some neighborhood committees will urge you to get vaccinated, and even more, they will give cash benefits.

3. Why did you get COVID-19 vaccine? 3. Establish an immune barrier. In April, Academician Zhong Nanshan called on everyone to plant it as soon as possible. China is a country with a large population. Only by increasing the vaccination coverage as soon as possible can we establish an immune barrier and resist the virus more effectively. If China's vaccination rate is relatively low and other countries are vaccinated, then when China is open to the outside world, our immunity is relatively low, so it is very important to vaccinate as soon as possible.