Italian scientists have proven that reinfection with coronavirus after recovery is relatively rare and that immunity against SARS-CoV-2 persists for a long time. The study, published in the journal JAMA Internal Medicine, is summarized in a press release on MedicalXpress.
Experts analyzed the medical records of more than 15,000 people and found 1,579 positive results for SARS-CoV-2. One year later, 3.9 percent of initially healthy people had contracted the coronavirus, and only 0.31 percent (five people) who had had COVID-19 had a second bout of the disease. Re-infection was defined as the occurrence of a new infection at least 90 days after traces of the virus from the initial infection had completely disappeared.
Researchers note that four of the five re-infected either worked in or visited a hospital, which is associated with a high risk of contracting the coronavirus. And only one in five had symptoms severe enough to be hospitalized. The average time from initial infection to reinfection was 230 days.
The researchers emphasized that all of this does not mean that those previously infected should skip the COVID-19 vaccination because it is unknown how the body will respond to new variants of the coronavirus.