A third shot of Sinopharm’s Covid-19 vaccine leads to a rebound in antibody levels that drop months after a second dose, a small-scale Chinese study showed.

A study published in Nature Communications reveals that patients who had been hospitalized with severe Covid-19 might not be totally safe after recovery, as they are more likely to harbor self-attacking antibodies than those who did not have the virus.

A study of 614 fully vaccinated health workers in India found a “significant” drop in their Covid-fighting antibodies within four months of the first shot.

Researchers from the Karolinska Institute in Sweden and University Children’s Hospital, Ruhr-University-Bochum, Germany, studied the impact of Covid-19 infections on lung function.

Three U.S. studies suggest Covid-19 vaccines offer strong protection against hospitalization and death, even in the face of the highly transmissible Delta variant, but vaccine protection appears to be waning among older populations, especially among those 75 and older.

What is the key to a robust immunity against SARS-CoV-2? According to a study recently published in The New England Journal of Medicine, it could be a previous SARS infection—more specifically, the one that spread across 29 countries between 2002 and 2004—plus vaccination. 

Heading into fall, with the Covid-19 pandemic surging again and researchers tracking new variants, there is plenty of news. BioSpace takes a look, including several research studies suggesting that some people have unusually strong immunity against Covid-19.

Data from Johns Hopkins University demonstrate that daily Covid-19 infections increased 316 percent from Labor Day 2020, or about four times more.

A study published in The Lancet Infectious Diseases found that the Pfizer-BioNTech, Oxford-AstraZeneca or Moderna vaccines resulted in a drop in “long-haul” Covid-19 by 50 percent. According to data collected by the American Academy of Pediatrics (AAP), more than 500,000 children tested positive in the United States for Covid-19 from August 5 to August 26.

A study published in the Journal of the American Medical Association by Belgium researchers comparing the Moderna and Pfizer-BioNTech Covid-19 vaccines found that the Moderna jabs generated twice the antibodies as the Pfizer-BioNTech vaccine.