First dose of vaccine is more effective in those who had Covid: study

Preliminary results of a study from the Israeli University of Bar-Ilan and Ziv Medical Center showed that the first dose of the Covid-19 vaccine it is most effective among those who previously had the disease.

The study, published in Eurosurveillance, the journal of the European Center for Disease Prevention and Control (ECDC), point to a immune response greater, regardless of when they contracted the coronavirus and whether or not I had antibodies detectable.

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The investigation was carried out among 514 health center workers, of whom 17 were infected between one and ten months before receiving the vaccine. The analysis requires a larger sample of people before reaching definitive conclusions, the institutions reported in a statement.

“This finding can help countries make informed decisions regarding the policy of vaccines, for example, if previously infected people should be vaccinated with priority and, if so, with how many doses ”, indicated Michael Edelstein, professor at the University of Bar-Ilan.

The effectiveness was similar between different ethnic groups, “although it is known that the virus it affects some groups more than others ”.

Researchers will advance the study with the “second dose to better understand how long it will protect the Covid-19 vaccine in different groups of people ”, they advanced.

People vaccinated against Covid-19 can infect others

Soumya Swaminathan, chief scientist at the World Health Organization (WHO) warned on Friday that some people vaccinated against Covid-19 they can still catch the virus and spread it to others, despite showing no symptoms.

Read also: UK variant of Covid could be up to 70% more lethal: study

“If you have the vaccine and you contract the disease, the viral load is much lower, so the chances of infecting others may also be lower ”, pointed out the expert at a press conference.

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In most clinical trials it has been shown that vaccines they protect against the development of severe forms of the disease, although it is not certain that they completely prevent infection.

Due to this possibility, the scientist explained that, until more research is done about it, it is important that people, even if they are vaccinated, continue to maintain security measures such as: use of face masks, frequent hand washing and maintaining a safe distance.

“Our understanding of this is evolving as different studies come out,” he added.

With information from EFE

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