Most of the people recovering from Kovid-19 Stay away from the virus for at least six monthsThe researchers gave this information in a large study from Denmark on Wednesday.
Prior infection with coronovirus reduced the likelihood of a second bout in people under 65 by almost 80 percent, but it was almost half of those over 65 years of age. But those results, published in the journal Lancet, were understood by many cavities.
The number of infected older people in the study was small. Researchers had no information beyond the results of the test, so it is possible that only mild people who were ill for the first time became infected again and the second infection was largely symptom-free.
Scientists have said that reintegration is likely to be asymptomatic or mild as the immune system can suppress the virus before it can do much damage. Researchers also did not assess the possibility of revision with new variants of the virus.
Still, the study suggests that immunity to a natural infection is unpredictable and disproportionate, and underscores the importance of vaccination to all – especially older people, experts said.
“You certainly can’t count on a chronic infection as a form of protection from getting sick again, and possibly quite ill if you’re in the elderly segment,” Staines Athelberg, one of Denmark’s public health agency Statens Serum Institute The epidemiologist said.
Because people over 65 are at the highest risk of serious illness and death, he said, “They are the ones we are most eager to protect.”
Rigid estimates of other infections have generally been rare because many people around the world did not initially have access to the test, and laboratories require genetic sequences from both rounds of testing to confirm a reconstruction. .
But the findings are consistent with those from experiments in a wide variety of settings: on sailors Fishing man in Seattle, Marine Corps Recruitment In South Carolina, Health note staff In the UK and Patients In clinics in the United States.
The design and size of the new study benefited from independent and abundant testing of Coronavirus of Denmark. About 70 percent of the country’s population was tested for the virus in 2020.
Researchers looked at the results of 11,068 people who tested positive for coronavirus during the first wave in Denmark between March and May 2020. During the second wave, from September to December, 72 of those, or 0.65 percent, tested positive again. Compared to 3.27 percent of those who got infected for the first time.
This translates into 80 percent protection from the virus, which was previously infected. Security for people over 65 dropped to 47 percent. The team analyzed the results of the test from approximately 2.5 million people during the epidemic, seven months after the entire infection, and found similar results.
Marion Papers, a pathologist at the University of Washington in Seattle, said, “It’s great to see that revisit over time didn’t make any difference.”
She and other experts noted that 80 percent may not look great, but that protection from disease-related illness is more likely. The analysis included anyone who was tested regardless of symptoms.
“Many of these will be asymptomatic infections, and many of these will be people who have a stroke of the virus,” said Florian Kramer, an immunologist at the Econ School of Medicine in Mount Sinai, New York. “Eighty percent risk reduction against asymptomatic infection is great.”
The findings suggest that people recovering from Kovid-19 should receive at least one dose of the coronavirus vaccine to boost their level of safety, Drs. Kramer said. Most people said a strong immune response to a natural infection produces, “but there is a lot of variability,” he said. After vaccination, “we don’t see the variability – we basically see too many reactions with very few exceptions in everyone.”
Experts were less confident with the results for people over 65, saying the findings would have been stronger if more people from that age group had been included in the analysis.
“I wish, it was really broken down into more than 65 distinct decades,” Dr. The paper said. “It would be nice to know that most of the people who were being resettled were over 80.”
The immune system becomes progressively weaker with age, and people over 80 typically respond weakly to infection with the virus. Akiko Iwasaki, an immunologist at Yale University, said the low safety in older people seen in the study is consistent with those observations.
“I think we forget how vaccines are wonderful for providing protection in this age group, because you can see that natural infection does not provide the same kind of protection,” she said. “It really emphasizes the need to cover older people with a vaccine, even if they have Kovid before.”