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Vaccines create active immunity through immune response and antibody production just like contracting the infection/disease does. The only difference is that the latter creates natural immunity, while vaccines create induced immunity. In either scenario, a person who has the antibodies to a specific disease (whether thru natural or induced immunity) can and sometimes will still become infected from the disease thru exposure to it. Science and medicine have never claimed otherwise. The advantage to vaccine immunization is that the antibody response prevents the infected person from becoming seriously ill from the infection. So even an unvaccinated person who was infected and recovered can still be reinfected and become an asymptomatic carrier and spread the disease to others. It's not just vaccinated people. It's ANYONE with ACTIVE immunity. And you cannot spread CoVid thru the vaccine. It does not use the actual virus to create immunity. Vaccinated carriers are a result of becoming infected with the virus after vaccination, not because of the vaccination. That is the entire point of vaccines. To give as many people as possible active immunity, without having to suffer the dangers of a full scale infection. If everyone has active immunity, either thru vaccination or contraction, then the disease becomes eradicated, and no one else gets sick and dies.