Share the QR code with wechat scanning code < / P > < p > to friends and circles of friends < / P > < p > Abstract: however, due to some restrictions in the emergency authorization of the new crown vaccine, doctors cannot recommend additional doses for specific populations (such as people with low immune function) < p > < / P > < p > according to the Wall Street Journal, the American Advisory Committee on Immunization (ACIP) initially expressed its support for injecting new crown vaccine booster injections into people with low immune function < p > but ACIP also said that they were waiting for the regulatory voice before they could put forward formal vaccination suggestions < p > previously, ACIP has been providing advice to the Centers for Disease Control and Prevention (CDC) and formulating recommended rules for vaccination in the United States. The Subcommittee is composed of experts in the fields of infectious diseases, immunology and public health < p > at present, as more and more evidence shows that the new crown vaccine is not as effective as other ordinary people in people with weak immune system, countries around the world are considering injecting booster into these people < p > according to CDC data, about 2.7% of adults in the United States are considered to have low immune function, including organ transplant recipients, some cancer survivors and HIV infected people, which makes their response to the vaccine weak, and the vaccine needs to provide protection by stimulating the immune system < p > analysis by some doctors and several studies show that organ transplant recipients often take powerful immunosuppressive drugs, which makes it difficult for them to produce antibodies < p > CDC staff also said that even if there was no strong antibody response at first, vaccination with enhancers would greatly strengthen the immune response. In four studies, one-third to one-half of subjects who had no antibody response after the first two doses of mRNA vaccine had an immune response after the third dose < p > at present, many countries have begun to take action to vaccinate some people with booster injections. France and Israel, for example, allow additional booster injections for people with low immune function, and Britain is considering similar measures < p > but there are some obstacles to such operation. Due to some limitations in the emergency authorization of the new crown vaccine, doctors cannot recommend additional doses for specific populations, such as those with low immune function. A CDC spokesman said ACIP would have to wait for the injection booster needle to be fully approved or the health regulatory authority to modify the authorization