The findings suggest that many, if not most, people recovering from coronavirus infection are safe for at least some time. They also suggest that the coronavirus vaccine may be able to keep people safe for more than just a few weeks.
One study found that people produce antibodies that protect against infection and last for at least five to seven months.
“We have a person who is out of seven months. We have a handful of people who are out in five to seven months,” Deepat Bhattacharya, an immunobiologist at the University of Arizona Medical College of Medicine in Arizona, told CNN.
Since developing a blood test for coronavirus, they have been working with county officials in Arizona since April 30 to test volunteers.
Like many researchers, they found coronavirus antibodies immediately after infection and then crashed. But that was not the end of the story.
The B cells that make antibodies mature into what are called plasma cells, Bhattacharya said. “Normally, you get short-term plasma cells,” he said.
“They make a ton of antibodies.” But these are not antibodies that do much to protect the body from the virus.
“The best cells compete with each other,” he said. “Only that long cells are formed. They form in subsequent feedback.”
The team has tested about 100,000 people and tested some that have been tested many times.
“I think that’s good news,” Bhattacharya said.
The novel coronavirus has only been around for less than a year, so it will take time to figure out how long the immunity lasts. “That said, we know that people who were first infected with SARS coronavirus, the most similar virus to SARS-CoV-2, are still seeing immunity after 17 years of infection. If nothing like SARS-CoV-2 first. One is, we expect antibodies to last at least two years, and that would be unlikely for anything too short, ”he said.
About 8,000 people became infected with the severe acute respiratory syndrome virus and about 800 people died before it was discontinued in 2004.
“People who are sick with Kovid-19 have higher immunity,” Bhattacharya said. “People taking samples from the ICU had higher levels of antibodies than those with mild disease.” He does not yet know what that will mean for long-term immunity.
Also, researchers have not checked to see if people have been infected with the virus a second time and are able to resist re-infection.
And studies do not support the idea that U.S. Or any other country may soon reach herd immunity through a natural infection. The World Health Organization estimates that only 10% of the population is infected with Kovid-19. It leaves a long way to go for the flock’s immunity.
However, the other two studies support the long-held idea of immunity.
Infectious Disease Specialist Dr. of Massachusetts General Hospital.
The other two antibody types – IgM and IgA – first spike in these patients and then crash. “We can now say that if a patient had IgA and IgM responses, they had been infected with the virus in the last two months.”
A pediatric infectious disease specialist working on the study, Dr. “We need to know how long the antibody responses last before we can use antibody testing to detect the spread of COVID-19 and identify the ‘hot spots’ of the disease,” said Jason Harris.
The Canadian team used saliva tests and found similar results. Their patients had IgG antibodies that lasted 115 days after they first developed symptoms.
“This study suggests that if a vaccine is properly formulated, it is likely to elicit a lasting antibody response that could protect the vaccinated person against the virus that causes COMIT-19,” said Jennifer Gomerman, University of Toronto Immunology. Professor, said in a statement.
“Our study suggests that saliva may act as an alternative to antibody testing. While saliva is not as sensitive as serum, it is easier to collect.”