According to a Monday report in infectious diseases journal the Lancet, researchers said that the unnamed 25-year-old man contracted coronavirus twice and became seriously ill following his second infection.
A 25-year-old man in the USA has been infected with the coronavirus twice, but the second infection was far more severe than the first, according to a case study on COVID-19 reinfection published on the Lancet Monday.
Apart from asthma he was fit and healthy, so the only thing left that could have caused it was the SARS-CoV-2 virus - either directly by causing cell death, or immune response's release of chemicals known to be toxic to the inner ear.
While there is now no proof that occurs with COVID-19, Shaman said he knows of no-one who can rule that out. "The people sampled from the ICU had higher levels of antibodies than people who had milder disease".
"Based on what we know about COVID-19, it would be too risky to try to achieve herd immunity through natural exposure to this virus, as it can be lethal or detrimental in people of all ages".
Previous findings inferred the production of antibodies from initial infections and suggested that levels of antibodies drop rapidly after infection, providing short-term immunity only. The World Health Organization estimates only 10% of the population has been infected with Covid-19.
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However, two other studies support the idea of long-lasting immunity.
She and her co-authors urged patients and doctors to log and track symptoms so that health researchers can learn more about the condition and how to ease it as swiftly as possible. The study results suggest that people with blood types "A", "B", or "AB" may be more likely to be infected with COVID-19 than people with type "O".
Dr. Mypinder Sekhon, author of the Canadian study and an intensive care physician at Vancouver General Hospital, said, "As a clinician, it is at the back of my mind when I look at patients and stratify them".
On the other hand, if immunity to SARS-CoV-2 was longer, perhaps through protection provided by immune response to infection with other endemic coronaviruses, we might experience what would initially appear to be an elimination of COVID-19 followed by a resurgence after a few years. Their patients had IgG antibodies that lasted up to 115 days after they first developed symptoms.
Nor should people worry unduly about the link between blood type and Covid-19, said Dr. Torben Barington, the senior author of the Danish paper and a clinical professor at Odense University Hospital and the University of Southern Denmark.
"Our study suggests saliva may serve as an alternative for antibody testing".