The vaccine against COVID-19 from the pharmaceutical company AstraZeneca is the one that is being applied in Mexico to adults between 30 and 39 years old. Until now, the first dose has been given to part of this population. What is the immunity provided by an injection?
Analysis of phase three clinical trials from the UK, Brazil and South Africa, published as preprint in the scientific journal The Lancet in February, this vaccine is safe and effective in preventing COVID-19, with no severe cases or hospitalizations, more than 22 days after the first dose.
The results showed a 76 percent vaccine efficacy after first dose for severe cases.
“The efficacy of the vaccine after a single standard dose from day 22 to day 90 after vaccination was 76 percent,” the document states.
With an interval between doses of 12 weeks or more, the efficacy of the vaccine increased to 82 percent.
The World Health Organization, for its part, indicates that the AstraZeneca vaccine “has a 63.09 percent efficacy against symptomatic infection by SARS-CoV-2 ″ after the second dose. Data that coincides with the one published by the Ministry of Health of Mexico.
A couple of weeks ago, a study found that the immune responses of this biological they improve with a longer interval, up to 45 weeks, between doses, with a third injection capable of further increasing antibody levels, according to a study from the University of Oxford.
Leave a A gap of up to 10 months between the first and second doses increased the level of protective antibodies, according to the research. The scientists were also able to show for the first time that a booster dose induced a strong response and increased activity against the variants.
With information from Bloomberg
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