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As per the study conducted by the US Centers for Disease Control and Prevention (CDC) announced Wednesday that it has been found that vaccination was indeed the safest way to safeguard people against Covid-19.
The CDC is set to release new data on Covid-19 vaccines, boosters and the Omicron variant this week. The information was collected before the Omicron variant emerged in America.
The researchers wrote: “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.”
In this recent study, researchers observed and studied the probability of Covid-19 infections to individuals between four groups: vaccinated with or without prior infection and unvaccinated with or without prior infection.
The research case data was taken from approximately 1.1 million California and New York cases between May and mid-November 2021. Hospitalization statistics were obtained from California alone.
At first, the infection and hospitalization rate was highest among unvaccinated people who had not been infected earlier.
Primitively, those with a prior infection had higher case rates than those vaccinated with no history of diagnosis earlier on. But when the Delta variant came sweeping in the US months later, the result shifted. Now, according to the research, the people who possessed prior infection had a lower case rate than those who were vaccinated alone.
The lead of CDC’s surveillance and analytics on the Epi-Task Force, Dr. Benjamin Silk, said, “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. Silk further added.
The research failed to point out that changing immunity through time. They also did not discuss how boosting doses could affect the situation. The study was also conducted prior to Omicron-variant discovery.