Only 17% of those vaccinated with the Janssen dose have antibodies six months after immunization, according to a serological report by the University of Évora in Portugal.
The study was coordinated by Carlos Sinogas, a professor in the University’s Department of Medical and Health Sciences. The official explains that one of the main conclusions of the research is that immunity decreases significantly in up to six months in people who took the Janssen vaccine.
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“After six months, if there is no Covid, we have only 17% of people with antibodies. If there was Covid, 71% of people still have antibodies,” says the study.
In the case of AstraZeneca, if there is no previous infection and six months after the second dose, 50% of people show antibodies. This percentage rises to 80% with the Pfizer vaccine and to 100% with the Moderna vaccine.
“If we put the vaccines in order to make a ranking: Moderna, Pfizer, AstraZeneca and Janssen”, declared Carlos Sinogas, who, however, says he prefers mRNA technology. “If you ask me for recommendations to vaccinate people tomorrow, I say: ‘Forget DNA vaccines, use RNA vaccines”, he says quoted by the station.
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