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Days ago, the results of the first wave of the serological study of the Spanish population revealed that only 5% of citizens had antibodies to the coronavirus. This fact caused pessimism among those who relied on herd immunity as a possible solution to crises. But now, a study suggests that some people may not have passed the disease but be immune to it.

The study was published in the journal Celly and was carried out by scientists at the La Jolla Institute of Immunology in California (USA). These researchers argue that some people may have certain level of immunity because they were already infected with other pathogens that made them develop certain defenses.

As Heraldo collects, these defenses they ‘ignite’ by recognizing the ‘enemy’, although only a small part of it. The researchers say that between four and six people in ten have this protection. His hypothesis is that this fact would explain why there have been so many asymptomatic or mild symptoms.

According to the researchers, T lymphocytes have two defensive strands against malignant agents: helper T cells that stimulate immune actors to be alert to viruses, and killer T cells that destroy infected cells.

Scientists have studied two types of T lymphocytes, generated against SARS-CoV 17 years ago, and discovered that there was a cellular immunity response to new attacks. In addition, they used several donor blood samples collected before the pandemic, and inserted fragments of the SARS-CoV-2 into them. Lymphocytes they recognized the aggressor and defended themselves. The study argues that T lymphocytes are those that help defend patients with few symptoms or asymptomatic.