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COVID vaccines: how long do they take to generate immunity?

» ProSalud

You know how long does it take to take effect COVID-19 vaccines? This depends on each option, indicates the Spanish Ministry of Health.

The Spanish authority reviewed the vaccines of Pfizer BioNTech, Modern, de AstraZeneca and Janssen, and found that the highest protection they provide changes depending on the vaccine.

In the case of the option Pfizer-BioNTech, the highest protection comes after the seven days later of the second dose. This can be given to a person after at least 21 days, the ministry indicates.

The option of Modern creates immunity after 14 days of the second dose, which can be received after 28 days.

Injection of AstraZeneca has higher protection 28 days after application of the second dose, which can be received between 10 and 12 weeks after the first one.

Meanwhile, Janssen provides protects starting on the 14th day of his administration. This is a vaccine a single dose.

The vaccine Pfizer It is of the mRNA type and needs to be at very low temperatures. According to a study from February 24, it is 92 percent effective to prevent serious illness after both injections, and 62 percent after just one.

Modern It is also of the mRNA type and requires refrigeration at temperatures of -20°. In January, the pharmaceutical company reported that its vaccine also provides protection for variants of the viruses identified in the United Kingdom and South Africa. On March 16, it was reported that trials are already being carried out on children under 12 years of age.

On the other hand, AstraZeneca has a viral vector vaccine that transmits within a harmless virus that is not the coronavirus the genetic information that the body needs to produce antibodies against SARS-CoV-2, indicates the ministry. A study published on March 22 showed that this option is 79 percent effective in preventing the disease. An independent board found no safety problems.

And Janssen has a vaccine similar to that of Astra, viral vector. It needs to be stored at low temperatures (-25°). On March 11, the European Medicines Agency (EMA) indicated that it is 67 percent effective.

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Yair Ramirez
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