Johnson & Johnson vaccine is 66% effective, but leaves doubts | Digital Trends Spanish


The US laboratory Johnson & Johnson announced that its single-dose vaccine is 66 percent effective in preventing COVID-19.

The results correspond to trials conducted globally with 44,000 volunteers and against multiple variants of the SARS-CoV-2 virus, the company said.

The J&J vaccine uses a common cold virus – adenovirus type 26 – to introduce coronavirus proteins into cells in the body and trigger an immune response.

The data is compared to the Pfizer / BioNTech and Moderna vaccines, which are 95 percent and 94.5 percent effective, respectively. Both are based on synthetic mRNA technology.

On the eve, Novavax announced an 89 percent effectiveness for its vaccine, the first protein-based.

Doubts about variants

Johnson & Johnson

The levels of protection were 72 percent if only studies conducted in the United States are considered, while in Latin America it reached 66 percent.

However, the effectiveness of the vaccine was only 57 percent in South Africa, where a highly contagious variant of the SARS-CoV-2 virus has been identified.

Studies suggest that this variant also reduces the effectiveness of the Covid vaccines made by Pfizer-BioNTech, Moderna, and Novavax.

The variant has spread to about 31 countries.

Effective in preventing serious cases

When applied in two doses, it was 95 percent effective in preventing symptomatic disease. However, these studies were only conducted in the United States.

The goal of the J&J study was to prevent moderate to severe COVID-19 cases.

According to the results, it was 85 percent effective in stopping serious illnesses and preventing hospitalization 28 days after vaccination.

The company plans to apply for emergency use authorization from the US Food and Drug Administration (FDA) in the first week of February 2021.

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