A detailed analysis by independent scientists showed that AstraZeneca's Oxford vaccine for the emerging corona virus (AstraZeneca) precisely follows the genetic instructions programmed into it by its developers to successfully elicit a strong immune response, according to Reuters.

"The vaccine does everything we expected, and this is good news in our battle against the disease," said David Matthews, a virologist from Bristol University who led the research.

And the health authorities in Brazil said yesterday, Wednesday, that a volunteer in a clinical trial on the aforementioned vaccine died.

But she added that the experiment will continue.

The vaccine was developed by the University of Oxford and AstraZeneca.

Oxford confirmed the decision to continue testing the vaccine, and said in a statement that after a careful evaluation of the situation, "there were no safety concerns in the clinical trial."

A source familiar with the matter told Reuters on Wednesday that the Brazilian experiment would have been stopped had the volunteer who died in it were among the group that received the vaccine.

This statement indicates that the volunteer was part of a control group in which the participants were given a meningitis vaccine.

Participants and investigators are not informed of which group they belong to.

CNN Brazil reported that the 28-year-old volunteer, who was living in Rio de Janeiro, had died of complications from Covid-19.

Agence France-Presse said that Bloomberg News and the Brazilian newspaper "Uglobo" said they had obtained confirmation from unknown sources linked to the tests that the volunteer received a dose of the placebo and not the vaccine under development.

During these third phase tests, which are the last before the vaccine is approved, half of the volunteers are injected with a placebo, and these are classified within a "control group."

Many media outlets revealed the identity of the Brazilian volunteer, explaining that he is a 28-year-old doctor who was on the front lines to combat the epidemic.

It appears he has died of complications related to COVID-19.

He worked in two hospitals in Rio de Janeiro and graduated from medical school last year.

Last September, Oxford vaccine testing was suspended after an "unclear disease" appeared in a volunteer in Britain.

But the independent committee concluded that it is not a side effect related to the vaccine.

About 20 thousand volunteers participated in the experiments in several countries, including 8 thousand in Brazil.