After the first dose of COVID-19 vaccine was inoculated in Guangzhou, there was a yellow kapok in the middle of Suikang yard; After the second dose of COVID-19 vaccine, there was a yellow kapok in the middle of Suikang yard. On May 6th, many residential areas in Guangzhou who had been vaccinated with COVID-19 vaccine found that their health codes had changed-there was a small kapok in the middle.