Studies suggest that coronavirus immunity can last for more than 6 months

However, new studies, neither peer-reviewed nor published in scientific journals, require analysis of multiple compartments of immune memory, such as antibodies, B cells, and T cells, over time, among other features of immune memory.

The study included 185 adults aged 19 to 81 years in the United States who recovered from Covid-19. Most adults had a mild illness.

Researchers at the La Jolla Institute for Immunology and Mount Sinai School of Medicine at the University of California, San Diego analyzed blood samples collected at various times after the onset of symptoms, some collected more than 6 months later. .. ..

In blood samples, researchers examined components of immune memory. They found that the antibodies were “durable” and showed only a “slight decrease” in 6-8 months, but that the levels of antibody response in adults ranged about 200-fold. I paid attention.

Researchers also found that memory B cells were detected in almost all Covid-19 cases, and that memory B cells appeared to increase over time. “B-cell memory for some other infections has been observed to be long-lived, including more than 60 years after smallpox vaccination or more than 90 years after influenza infection,” the researchers study. I am writing in.

Researchers have identified two types of T cells, the data saying, “T cell memory is slower than the first 6 months after infection and may reach a more stable plateau or a later decay phase.” writing.

There are limits to this research. For example, more research is needed to determine if similar findings will appear in more people at more times.

“Overall, this is an important study confirming the existence of immune memory for SARS-CoV-2, but it varies from person to person,” said Lawrence Young, a professor of molecular oncology at the University of Warwick. It states as follows. Statement distributed by the UK-based Science Media Center on Wednesday. SARS-CoV-2 is the name of the new coronavirus.

“This variation may be due to some individuals with very low levels of asymptomatic infections. Individuals who were previously infected with a low immune memory response were affected by SARS-CoV-2. It can be expected to be susceptible to reinfection, “Young said. , Those who were not involved in new research.

“But the important take-out message is that the immune response to the virus is longer-lived than previously thought, which keeps us hoped that an effective vaccine can induce sustained protective immunity. can do.”

We still don’t know how long it will last longer than previously thought.

As far as other viruses are concerned, a single measles attack usually immunizes someone for life. This is an effect known as sterile immunity. The same is true for smallpox, the virus being eradicated in the 1970s by a global vaccination campaign. In addition, proper vaccination against measles and smallpox will completely prevent infection.

However, respiratory viruses such as influenza require caution. People can get the flu many times, and influenza vaccines generally provide only partial protection against infections and serious illnesses. Part of that is because the flu tends to mutate.

The coronavirus seems to be in the middle.There is Seven known coronaviruses that can infect humans And SARS-CoV-2 is just one example of them. Many human coronaviruses can cause the common cold, but they are usually not fatal and have not been well studied.

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