The inability to fully immunize against the new crown vaccine may be related to the different sensitivities of each vaccinated individual to the new crown vaccine, as well as to the characteristics of the new crown vaccine itself.
Regardless of the type of vaccine, reactivity to it varies among vaccinated individuals. In most people, the vaccine stimulates the immune system to respond, but in a very small number of people, the vaccine does not produce an immune response and the body does not produce antibodies.
The current New Crown vaccine is a relatively new vaccine, and research on it has shown that the approved New Crown vaccine does not provide lifelong immunity after vaccination. This may be due to the nature of the New Crown virus and the lack of in-depth research on the New Crown virus, and the development of a safer, more effective vaccine that provides long-lasting immunity is still pending.
For these reasons, the Neocollins vaccine does not provide complete immunity, and to date, no vaccine has been shown to provide 100% immunity.