Less than one out of every 1,000 people who are fully vaccinated against the coronavirus or have previously had COVID-19 subsequently ends up in the hospital with a coronavirus infection, U.S. researchers from the Mayo Clinic say. The experts' study confirms the findings of previous work that vaccination is the best way to prevent severe COVID-19, protect against hospitalization and mortality. The study authors looked at data from more than 100,000 patients over the age of 18. All were vaccinated against the coronavirus and tested positive. Of the total, only 69 were subsequently hospitalized because of severe coronavirus infection. Thus, the hospitalization rate was 0.06% for vaccinated patients, 0.03% for those who had previously been sick but had not been vaccinated, and 0.01% among those who had both had the disease and gone through the full course of vaccination. According to the researchers, the differences between the three groups listed are not really statistically significant. However, the results of the current observation support the conclusions of past work that vaccination is as reliable a tool for providing immunity as the disease suffered.