Natural or vaccination-acquired immunity: Which is more effective against delta variant? Recently researchers in Israel compared the natural immunity acquired from infection and vaccination-acquired immunity.
According to their research combination of natural immunity and one dose of vaccine may be the most effective way to prevent reinfection.
The new study answers questions such as: How long does the protection last? Are the vaccines effective against the Delta variant? Are the vaccines as effective as natural immunity?
The findings of the new research are yet to be peer-reviewed, and it appears on the preprint server medRxiv.
Researchers in Israel conducted this study. The country has one of the highest rates of COVID-19 vaccination in the world. Israel has shown a recent surge in cases involving the Delta variant.
They compared the rates of infection after vaccination with the rates of reinfection. They obtained the data from the Maccabi Healthcare Services database, Israel’s second-largest health maintenance organization.
The research shows people who had never had the infection and received a vaccine were up to 13 times more likely to contract the virus compared to people who had already had the infection.
The overall study found that the rate of contracting the infection was double among unvaccinated people compared to those who had received one dose of the vaccine.
“All the vaccines we have, Moderna, Pfizer, and Johnson & Johnson, are very effective in preventing hospitalization — a severity of illness that requires admission to the hospital,” Dr. William Schaffner, a professor of infectious diseases at Vanderbilt University Medical Center, in Nashville, TN, said.