Scientists who have been monitoring immune responses to the virus are now starting to see encouraging signs of strong, lasting immunity, even in people who developed only mild symptoms of Covid-19, a flurry of new studies suggests.
A 25-year-old was infected twice with the coronavirus earlier this year, scientists in Nevada have confirmed. It is the first confirmed case of so-called reinfection with the virus in the U.S. and the fifth confirmed reinfection case worldwide.
“Wait. I can catch Covid twice?” my 50-year-old patient asked in disbelief. It was the beginning of July, and he had just tested positive for SARS-CoV-2, the virus that causes Covid-19, for a second time — three months after a previous infection. While there’s still much we don’t understand about immunity to this new illness, a small but growing number of cases like his suggest the answer is “yes.”
People who have recovered from Covid-19 may lose their immunity to the disease within months, according to research suggesting the virus could reinfect people year after year, like common colds. Blood tests revealed that while 60% of people marshalled a “potent” antibody response at the height of their battle with the virus, only 17% retained the same potency three months later.
South Korean officials on Friday reported 91 patients thought cleared of the new coronavirus had tested positive again, they believe that the virus may have been "reactivated" rather than the patients being re-infected.
Dr Tothill is an expert in infectious transmission. He offers insight into reinfection and other important COVID related information in this Q&A session.
Doctors in one hospital in Wuhan found that five of 147 patients in a study tested positive again after recovery. The recovered patients showed no symptoms after testing positive again, and Doctors found no evidence that they became infectious after recovery as their family members tested negative.