How long does the immunity of patients cured by the Coronavirus last? What New Discovery Says

Now we have a better answer to a fundamental question about David-19: How long does immunity last?

A new study suggests that patients cured by the Coronobrus are likely to have a strong immune memory that lasts for at least 8 months.

And this memory relies on more elements than just antibodies.

It also includes white blood cells, known as T cells, and B cells that have an impressive power of their memory. Combined together, these protective layers allow the immune system to recognize and re-attack the coronavirus, if he invades the body again, thus preventing a new infection.

To assess how long the immunity to Covi-19 lasts through these different layers of the immune system, scientists measured how many and which types of immune cells were recovered to coronary patients several months after they were sick.

The majority creates a huge immune response to this virus, and this lasts 6-8 months” - says Shane Crotti, virologist at the La Yolla Institute for Immunology in U.S. California, simultaneously coauthor of the study. Some studies have suggested that the number of antibodies generated by the coronary that protect the body from infection falls within a few months.

But concerns about these findings can reduce the role of killer T cells, which identify and destroy infected cells as well as T-cells, which instruct B cells to create new antibodies. The expert group measured both types of T cells, but even B cells and antibodies, in blood samples of 185 people who had been cured by Covid-19.

Nearly 40 of the participants gave blood many times, some more than 6 months after their illness. This enabled scholars to appreciate how immune reactions over time changed

Their results, showed that the level of the specific T cells of coronary to patients, dropped slightly between 4-6 months, and then remained at stable levels. Researchers believe that T cells and antibodies will likely remain stable after 6 months, which is typical of other viruses.

“This takes about 1 or 2 weeks to develop antibodies and reactions to T cells after an infection. They then grow and reach a peak of”- says Alessandro Sete, an immunologist at the La Jolla Institute. The study's findings also showed that B cell levels in patients increased the period of 1-6 months.

This is something very positive, Seth explains, as B cells are the source of antibodies in the future. “Once the original viral invasion is over, B cells will stop fighting, and will therefore stop producing antibodies. But they're still there if the attack resumes. If you have an extensive B cell operating in your body, it would regeneration a response to antibodies” - he points out.

Sete and Crotti were able to observe only patients affected by the coronary and healed up to 8 months after the infection, as the pandemic began only about a year ago. But they think that the slow rate of loss of T cells and B cells in patients means that those cells will exist much longer than the time period analyzed in the study.

White blood cells developed in response to other viruses can remain in the human body for years. For example, T cells specific against smallpox may take about 10 years to disappear after an infection, while B cells designed to fight the same virus last 60 years.

T cells for SARS, another coronary that has 80 percent of its genetic code similar to Covid-19, also appears to exist for a long time in the human body.

But until scientists have more time available to study the virus, Stete and Crotie point out, there will be no way of predicting how long a certain person's immunity to the choreography will last after he has been infected.