Dual immunity maintains effectiveness against COVID-19 for 6 to 8 months

This is the conclusion of a study conducted by scientists from Brazil, Sweden and the United Kingdom recently.

According to scientists, governments can rely on the above findings to make policies on vaccination or vaccine passports.

The results of the study also contradict previous suggestions that people who have had COVID-19 do not “benefit” from vaccination.

Julio Croda, an expert in epidemiology and infectious diseases at the Oswaldo Cruz Foundation in Rio de Janeiro (Brazil), and his colleagues reviewed data on vaccinated and COVID-19 cases. 19 in Brazil.

They found that, between February 2020 and November 2021, there was a decrease in people who had COVID-19 and then received a shot of a vaccine from Pfizer-BioNTech, AstraZeneca, Sinovac or Johnson & Johnson. approximately 45% risk of reinfection.

Meanwhile, completing the basic vaccination regimen of two-dose vaccines can prevent 65% of the risk of reinfection and more than 80% of cases with the risk of severe disease.

Some authorities rely on their past COVID-19 status to decide whether to allow individuals to go to public places such as theaters or restaurants, but others require people to have vaccination certificate.

This distinction prompted him and his colleagues to conduct research on the related issue, says Peter Nordström, an epidemiologist at Umeå University in Sweden.

Looking at records collected by the Swedish Public Health Agency between March 2020 and October 2021, the researchers found that Swedish residents who had been infected with the SARS-CoV- 2 have a 95% lower risk of re-infection with COVID-19 than those without immunity, while their ability to protect themselves also increases for 3 months after infection with the virus and lasts until at least 20 months after recovery.

The study was conducted on people who had been infected with COVID-19 and then received 2 full doses of the basic vaccine. The results showed that these people’s ability to protect themselves from COVID-19 was at almost 100% for at least 6 to 8 months after the second injection. Scientists say the protection gradually decreased. over time in vaccinated individuals, but persistently high levels in those with “dual immunity”.

However, these studies are based on data collected before the Omicron variant appeared. Therefore, scientists still need to conduct more studies in the new situation.

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