One needle can have an immune effect, which is always about 60% of the immune rate, and the possibility that two needles produce antibodies at 80% of the immune rate is the same, which is about 97%. This is our domestic vaccine, but we don't know about vaccines from other countries. However, it is said that the vaccine made by Pfizer in the United States and the vaccine made by this Indian company have serious adverse reactions, and they have not been really popularized on a large scale. Even India's health minister said it was possible not to get an injection.
Two shots is the best choice when the vaccine is sufficient, because two shots can achieve nearly 80% immunity and produce about 97% antibodies. This kind of security is still very good, which is more conducive to maintaining everyone's life safety. If it is an industry with a high possibility of exposure to related viruses, it is natural to have two injections, such as doctors, nurses and customs inspections. They have more construction opportunities. For safety reasons, two injections are a better choice, and we ordinary people work in a fixed environment and will not be exposed to these things. Even if there is contact, there may be contact, and basically a needle can achieve good results.
If you shoot it twice, there will be an interval of about a month. After a shot, it will have an immune effect. That is to say, the immunization period of our domestic vaccine is about one year, and there is no problem at all. A year later, it is estimated that the virus will appear. Even if it becomes a normal state, people are no longer afraid. When they first started smoking, people had no experience in dealing with the virus and didn't know what kind of characteristic it was. So we have spent a lot of interest in prevention and control, and the effect is not so good, but now our cognition is relatively complete and experienced, unlike at the beginning, so it is easier to protect.
Generally speaking, if your working environment is not fixed, you won't come into contact with unexpected people, and it is unlikely that you will come into contact with COVID-19. You can get a shot, because many developed countries abroad don't have that many vaccines, so they have to import a shot. Although we have our own production capacity, taking a shot is free, but how many shots we take is not up to us. It depends on how our local official medical institutions define it.