Study: Previously infected and unvaccinated people more than twice as likely to be infected again

A study by the US Centers for Disease Control and Prevention, published Friday, showed that people who were not vaccinated against Covid were more than twice as likely to be infected again with the epidemic compared to those who received the vaccine.

The health agency said that this finding supports its recommendation "that the COVID-19 vaccine be given to all eligible persons, regardless of their previous infection with SARS-CoV-2."

Many people who have previously been infected with the Corona virus consider that there is no need to take the Covid vaccine to gain immunity from the previous infection.

The study included 246 adults from Kentucky who were infected again in May and June of this year after they had previously been infected in 2020, and they were compared with 492 other participants who matched them in terms of gender, age and first infection.

The study found that unvaccinated people were 2.34 percent more likely to get infected with the virus a second time compared to those who received the full Pfizer vaccine.

The study indicated that the duration of immunity acquired from infection is still not understood and may be affected by the latest mutations of the virus.

For example, laboratory studies have shown that blood samples taken from people who were previously infected with the original version that appeared in Wuhan had antibodies that had a weak response to the beta mutant that appeared for the first time in South Africa.

But among the downsides of the study is that it was conducted before the emergence of the delta mutant, which is currently the dominant version in the United States.