Boosters Shot Provide Best Protection Against Omicron



According to a new study by the US centers of Disease Control and Prevention (CDC), when Delta variant was most prevalent in the US prior vaccine and natural immunity through prior infection provided the most protection, the CNN Health writes.

“During May–November 2021, case and hospitalization rates were highest among persons who were unvaccinated without a previous diagnosis. Before Delta became the predominant variant in June, case rates were higher among persons who survived a previous infection than persons who were vaccinated alone. By early October, persons who survived a previous infection had lower case rates than persons who were vaccinated alone.”

The CDC Report

Although the epidemiology of COVID-19 might change as new variants emerge, vaccination remains the safest strategy for averting future SARS-CoV-2 infections, hospitalizations, long-term sequelae, and death.

– The CDC Researchers (source: CNN Health)

In a call with media, Dr. Benjamin Silk, lead for CDC’s surveillance and analytics on the Epi-Task Force, reportedly told “Experts first looked at previous infections confirmed with laboratory test by the spring of 2021, when the Alpha variant was predominant across the country. Before the Delta variant, Covid-19 vaccination resulted in better protection against a subsequent infection than surviving a previous infection. When looking at the summer and the fall of 2021, when Delta became the dominant in this country, however, surviving a previous infection now provided greater protection against subsequent infection than vaccination.”

Dr. William Schaffner, an infectious disease expert at Vanderbilt University Medical Center and a vaccine adviser to the CDC, told CNN “If a person who’s had natural Covid then gets vaccinated, they have levels of antibody that are much, much higher than after the natural infection itself. And what we know about higher levels of antibody is: one, you usually get a longer duration of protection, and number two, the variety of antibodies that your immune system produces is more diverse. The notion is that you will be better protected against a diversity of variants.”

Referring an another study published in the medical journal JAMA CNN Health writes that “having a booster helped prevent people from becoming ill with Omicron. That study of just over 13,000 US Omicron cases found that the odds of developing a symptomatic infection were 66% lower for people who were boosted compared to those who had only received two shots.”

Quoting CDC data, the Washington Post writes “unvaccinated adults age 65 or older who contracted the coronavirus were 49 times more likely to require hospitalization than seniors who had received booster vaccine doses.”

Coronavirus-19 vaccination watch

According to the US Centers for Disease Control and Prevention (CDC) COVID vaccination tracker page (as of Jan 22, 9 a.m.) 659,822,615 doses have been distributed and 533,915,132 doses administered. According MDH COVID-19 Response vaccine data (as of Jan 19) a total of 9,081,646 doses of Covid-19 (Pfizer & Moderna) vaccines have been administered in Minnesota. According to the MDH latest tally (as of Jan 21) the confirmed COVID-19 cases in Minnesota are 1,216,734 (out of 17,486,321 tested) with 11,151 deaths.