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Kexing vaccine is currently promoting the third injection, but only volunteers who have finished two injections can take it. Because according to the second phase of clinical research that has been completed recently, volunteers who have finished two injections can take the third injection after three months and half a year, and the antibody can quickly jump to ten times in one week and twenty times in half a month. However, we still have to observe how long the continuous protection effect of the two vaccines is in the real world research process.