David Dowdy of Johns Hopkins Bloomberg School of Public Health. “Infection with this virus, if you survive, you do have some level of protection against getting infected in the future and particularly against getting serious infection in the future,” said Dr. A more recent study from the CDC, looking at data from nearly 190 hospitals in nine states, determined that unvaccinated people who had been infected months earlier were five times more likely to get COVID-19 than fully vaccinated people who didn’t have a prior infection. The Centers for Disease Control and Prevention reported in August that COVID-19 survivors who ignored advice to get vaccinated were more than twice as likely to get infected again. It’s also difficult to reliably test whether someone is protected from future infections. For example, a person who had a minor case one year ago is much different than a person who had a severe case over the summer when the delta variant was raging through the country. That’s because how much immunity COVID-19 survivors have depends on how long ago they were infected, how sick they were, and if the virus variant they had is different from mutants circulating now. Natural immunity is also far from a one-size-fits-all scenario, making it complicated to enact sweeping exemptions to vaccines. Scientists acknowledge that people previously infected with COVID-19 have some level of immunity but that vaccines offer a more consistent level of protection. Conservative federal lawmakers have implored regulators to consider it when formulating mandates. Lawsuits over the mandates have also begun leaning on the idea.
Florida wrote natural immunity into state law this week as GOP lawmakers elsewhere are pushing similar measures to sidestep vaccine mandates.
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