But antibodies work best. Best way to not spread covid is to have antibodies from already having recovered from the covid cold. Since I am tired of responding to ignorant people, here you go: Covid reinfection is "rare". Covid infection from vaccines is at best 5%, which is much more likely than "rare"
"Some level of immunity after SARS-CoV-2 infection is expected; however, the evidence regarding duration and level of protection is still emerging (2). The Kentucky Department for Public Health (KDPH) and a local health department conducted an investigation at a skilled nursing facility (SNF) that experienced a second COVID-19 outbreak in October 2020, 3 months after a first outbreak in July. Five residents received positive SARS-CoV-2 reverse transcription-polymerase chain reaction (RT-PCR) test results during both outbreaks. During the first outbreak, three of the five patients were asymptomatic and two had mild symptoms that resolved before the second outbreak. Disease severity in the five residents during the second outbreak was worse than that during the first outbreak and included one death. Because test samples were not retained, phylogenetic strain comparison was not possible...
Among 12 residents who received positive test results during the first outbreak (July–August) and were still living in the facility in October, five also received positive results during the second outbreak >90 days after the date that their first specimens were collected. These patients were classified as having recurrent cases of COVID-19...
The five patients with recurrent COVID-19 ranged in age from 67 to 99 years... Among these five patients, only two (patients C and D) were symptomatic during the first outbreak
The finding that all five patients with recurrent COVID-19 had either asymptomatic or mildly symptomatic courses during their first infections is noteworthy, suggesting the possibility that asymptomatic or mildly symptomatic initial infections do not produce a sufficiently robust immune response to prevent reinfection...
Reinfection risk to the general population is suspected to be low, but SNF residents might have higher risk for new exposures, given the congregate nature of these settings and ongoing interactions with HCP and other residents. In addition, the level and duration of postinfection immunity in persons with an aging immune system is unknown, but the potential health consequences of reinfection among SNF populations remain serious. Therefore, steps to protect this population from the ongoing potential of SARS-CoV-2 exposures should be implemented.
Based on the observations of this study, testing and cohorting practices in SNFs should not assume that residents infected >90 days earlier are immune to COVID-19. Public health interventions to limit transmission are vital for all persons in SNFs, including those who have previously been infected with SARS-CoV-2; these include physical distancing, use of masks (including by SNF residents, if tolerated), and frequent hand hygiene using hand sanitizer with 60%–95% alcohol or washing with soap and water for at least 20 seconds. Vaccination in these settings, as recommended by the Advisory Committee on Immunization Practices, is particularly important to optimally protect these vulnerable persons (10)."