Two new medical studies show that people who have contracted COVID-19 once are unlikely to be positive again for six months or more.
Researchers have found that people with natural infection antibodies have a “much lower risk… the same protection you get from an effective vaccine.” One of the studies of the National Cancer Institute.
He said: “Re-infection is very rare.”
Both studies used two types of tests. One is a blood test for antibodies, which attach to the virus and help eliminate it. Antibodies can last for months after infection. Another type of test uses nasal cavity or other samples to detect viruses or some of them, suggesting a current or recent infection.
A study published on Wednesday by the New England Journal of Medicine involved more than 12,500 health workers at Oxford University Hospital in the United Kingdom. Of the 1,265 patients who initially had coronavirus antibodies, only two tested positive for active infection in the following six months, and none of them showed symptoms.
This is in stark contrast to the 11,364 workers who initially had no antibodies. In the next six months, 223 of them tested positive for the infection.
Next, the vaccine expert from the Florida Vaccination Line said.Desantis
The National Cancer Institute’s research involved more than 3 million people, and they were tested for antibodies in two private laboratories in the United States. Less than 1% of people who initially had antibodies later tested positive for coronavirus, while only 3% of people who lacked antibodies later tested positive.
Sharpless said it was “good” to see that researchers at the University of Oxford saw the same risk reduction-if antibodies are present, the chance of a second infection is 10 times lower.
The report of his institute is published on a website that scientists can use to share research results, and the report is being reviewed by major medical journals.
Infectious disease expert Joshua Wolf said the discovery was “not surprising” but reassuring because “it tells people that immunity to the virus is common.”
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Wolf said that antibodies themselves may still not be protection. They may just be signals that other parts of the immune system can resist any new virus exposure.
Wolf added: “We don’t know how long this immunity will last.” People have been infected with COVID-19 multiple times, so “people still need to protect themselves and others by preventing reinfection.”
The Associated Press contributed to this report.