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Increase the interval between shots of COVID-19 vaccine vaccine

AstraZeneca’s COVID-19 vaccine. Photo: AFP/VNA

This is the conclusion made in a preliminary study conducted by Oxford University – a partner in the development of a COVID-19 vaccine with AstraZeneca – and published on June 28.

According to the study, the immune response is increased if the interval between the first and second doses of the AstraZeneca vaccine is up to 45 weeks. There are even cases where the body still has a good immune response when the second dose is given 10 months after the first one. If the third dose is given more than 6 months after the second, it can significantly increase antibodies and reinforce the immune response.

This is a draft study, not yet evaluated and verified by the council. However, according to Andrew Pollard, a researcher at the University of Oxford, this new finding may relieve some of the anxiety of countries that are in short supply of vaccines and have to delay the second injection for people. .

The researchers also said that extending the third dose of AstraZeneca’s vaccine has also yielded positive results, as many countries are considering whether a third booster dose is needed to prolong the ability to get vaccinated. immune or not.

It is not yet clear whether additional shots are needed to prevent weakened immunity or to boost immunity against worrisome variants, said lead researcher Teresa Lambe. However, according to her, the results of this study are meaningful in terms of whether or not a third injection should be given. Research from the University of Oxford also shows that the side effects of this vaccine are generally tolerable, with side effects after the second and third injections being lower than those of the first dose.

So far, 160 countries and territories have deployed AstraZeneca’s vaccine.

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