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Data released by the U.S. Centers for Disease Control and Prevention found that among hospitalized patients with symptoms similar to COVID-19, unvaccinated people with a previous novel coronavirus infection were five times more likely to test positive than fully vaccinated people.  

“These findings suggest that among hospitalized adults with COVID-19-like illness whose previous infection or vaccination occurred 90-179 days earlier, vaccine-induced immunity was more protective than infection-induced immunity against laboratory-confirmed COVID-19,” said study authors.  

WHY IT MATTERS  

The agency used data from 187 hospitals in the VISION Network, which includes Columbia University Irving Medical Center, HealthPartners, Intermountain Healthcare, Kaiser Permanente Northern California and Northwest, Regenstrief Institute, and University of Colorado.   

By examining data from adults hospitalized between January and September 2021, 2 tylenol 3 dosage it compared the odds of testing positive for COVID-19 among adults who had not received an mRNA vaccine, but who’d had a previous novel coronavirus infection, with individuals who had gotten two Pfizer or Moderna shots.  

The chances of testing positive for COVID-19 were 5.49 times higher among the former group.  

The benefits of vaccination in this particular study appeared to be higher for Moderna recipients and for those older than 65. The agency noted several limitations, including potential misclassification of patients and selection bias.   

The study only examined adults who had tested positive more than three months prior to their hospitalization in order to reduce the chances that their illness was related to an ongoing infection rather than a new one.

It also did not include those who had received only one mRNA vaccine dose, those who obtained their second shot less than two weeks before hospitalization or those who received the Johnson and Johnson vaccine.  

In addition, wrote researchers, “These results might not be generalizable to nonhospitalized patients who have different access to medical care or different healthcare-seeking behaviors, particularly outside of the nine states covered.”  

Overall, they said, the messaging remains consistent: Everyone eligible should get the vaccine – including those who have already had COVID-19.    

THE LARGER TREND  

As the COVID-19 pandemic continues, more data has become available about the disease, and about who is particularly vulnerable to it.  

This past month, the CDC published the rates of COVID-19 cases and deaths by vaccine brand for the first time. Although efficacy differed by type, unvaccinated people had a 6.1 times greater risk of testing positive for COVID-19 in August 2021, and an 11.3 times greater risk of dying from the disease.  

But hesitancy still remains an issue. Although digital health tools can help, advocates and strategists say getting shots into arms will require a thoughtful response.  

ON THE RECORD  

“This report focused on the early protection from infection-induced and vaccine-induced immunity, though it is possible that estimates could be affected by time,” wrote CDC researchers.   

“Understanding infection-induced and vaccine-induced immunity over time is important, particularly for future studies to consider,” they added.

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