Skip to main content
Premium Trial:

Request an Annual Quote

For a Second Time

Though re-infections are rare, people over the age of 65 are more likely to be infected with SARS-CoV-2 twice, according to the Guardian.

Researchers from the Statens Serum Institut in Copenhagen conducted a population-level observational study using national PCR testing results to examine possible repeat SARS-CoV-2 infections. As they report in the Lancet, they found natural SARS-CoV-2 immunity led to protection against reinfection six months later about 80 percent of the time. They note, though, that people 65 years old and older had lower natural immunity levels following infection and about 47 percent protection against reinfection.

"Our study confirms what a number of others appeared to suggest: reinfection with COVID-19 is rare in younger, healthy people, but the elderly are at greater risk of catching it again," senior author Steen Ethelberg from SSI tells the Guardian.

The New York Times cautions that the number of individuals over the age of 65 in the analysis was small. Still, Yale University's Akiko Iwasaki tells it that the findings "emphasize the need to cover older people with the vaccine, even if they have had COVID first." 

The Scan

Omicron's Emergence

The World Health Organization has called Omicron a SARS-CoV-2 "variant of concern," the Los Angeles Times writes.

Not as Much

Merck's pill to treat COVID-19 reduces the risk of hospitalization and death among COVID-19 patients by less than previously reported, the New York Times says.

Bats That Hang Together

Discover magazine writes that researchers have found a social microbiome among vampire bats.

PLOS Papers on CEWAS, Simian Varicella Virus Transcriptome, Dermatomyositis Markers

In PLOS this week: multi-omic approach to home in on genetic risk variants, transcriptomic analysis of the simian varicella virus, and more.