Martin Kulldorf, “Among many surprising developments during this pandemic, the most stunning has been the questioning of naturally acquired immunity after a person has had the Covid disease. (…)
We have lived with endemic coronaviruses for at least a hundred years, for which we have long-lasting natural immunity. As expected, we also have natural immunity after Covid-19 disease, as there have been exceedingly few reinfections with serious illness or death, despite a widely circulating virus.
For most viruses, natural immunity is better than vaccine-induced immunity, and that is also true for Covid. In the best study to date, the vaccinated were around 27 times more likely to have symptomatic disease than those with natural immunity, with an estimated range between 13 and 57. With no Covid deaths in either group, both natural and vaccine immunity protect well against death.
During the last decade, I have worked closely with hospital epidemiologists. While the role of physicians is to treat patients and make them well, the task of the hospital epidemiologist is to ensure that patients do not get sick while in the hospital, such as catching a deadly virus from another patient or a caretaker.
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