Covid-19 vaccine: how long does it take to protect after injection?

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Around the world, countries have begun mass vaccination of the population; Along with this, several questions arise about vaccination campaigns and, in particular, about the time between injection and the start of vaccine protection.

In general, phase 1 of the vaccination campaigns against Covid-19 only affect the elderly of the elderly, as well as people called "at risk" who work in health facilities.

The vaccine licensed in several countries is that of the Pfizer and BioNTech laboratories. It is a messenger RNA vaccine and vaccination is carried out in two stages. A first dose is injected into the patient first. If the patient does not have serious side effects, he can receive the second injection 21 days later.

Covid-19: Since when does the vaccine protect us against diseases?

There are still many questions about this vaccine, including when it confers immunity against the coronavirus. The US Drug Agency reviewed the results of a Pfizer and BioNTech study conducted on phases 2 and 3 of the BNT162b messenger RNA vaccine.

According to its results, the vaccine protects the organism by 52.4% ten days after the first injection. Seven days after the second dose of the vaccine, the protection rate is 95%.

This protection would make it possible in particular to prevent mild and moderate forms of coronavirus. Researchers do not yet have enough data to confirm its efficacy in severe forms of the disease. At this time, the duration of immunity after injection is still unknown.

In the coming months, other vaccines may be deployed. This is particularly the case with the Moderna vaccine, which is also a messenger RNA vaccine. In early December, a study published in the New England Journal of Medicine found that the vaccine produced antibodies more than 90 days after injection.

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