How long can the coronavirus vaccine protect the human body? Scientists have yet to give an answer. For the first batch of vaccinators last winter, perhaps the protection period will expire as early as this fall.
Some people think that people may have to be vaccinated against the coronavirus on a regular basis, as they do with influenza vaccines all the year round. In theory, anyone who is worried about the failure of vaccine protection can be tested for antibodies, but for cancer patients and people with compromised immune systems, this is not so simple.
Bennell, chief medical officer of the Boston-based Dana-Farber Cancer Institute, said: “The good news is that we can test whether you have developed antibodies because of the vaccine. The bad news is that we don’t yet know how to interpret the results.”
The gap in cognition and testing has caused vaccinators to worry about whether the vaccines they are given still provide protection. This anxiety may make people less keen to go to public places and is not conducive to the recovery of the global economy.
Scientists are scrambling to figure out the so-called vaccine protection related factors, that is, to find out which test results can confirm the effectiveness of immunity.
Mina, an epidemiologist at Harvard University’s Chen Zengxi School of Public Health, said that the new data will help researchers understand which immune characteristics reflect protection, but it may take several months to figure out. There is increasing evidence that antibody protection can last for at least six months, after which it is unknown.
People with impaired immune systems hope to get some scientific data to determine whether they are protected, including blood cancer patients, autoimmune disease patients, and love disease patients.
Mina explained that to determine which antibody level is sufficient to provide strong protection, long-term testing of large groups of people is necessary to determine when the virus can break through the antibody barrier. Some patients may not have special antibodies, but they can still rely on certain factors in the immune system (such as B cells and T cells) for protection. Therefore, the virus may not be killed by the antibodies triggered by the vaccine.
Greenberg, the chief scientific officer of the American non-profit organization Leukemia and Lymphoma Association, said that early studies of cancer patients have shown that antibody responses vary by individual and condition. In one type of cancer, “40-50% of patients do not produce antibodies. In another type of blood cancer, everyone produces antibodies.”
He said that almost all healthy volunteers produce powerful antibodies, but since there are other members of the immune system that can “kill the enemy”, it is not clear what a zero antibody result means, and can only say “this is a warning sign.” .
In view of the vague conclusions, the US Centers for Disease Control and Prevention stated that “antibody tests are not recommended to assess immunity” after vaccination for people with immune problems.