Israeli researchers warn of new international COVID wave, driven by Delta comeback Omicron didn’t wipe out the previous variant, which is super-resilient and could reemerge with a vengeance, according to peer-reviewed study based on cutting-edge sewage monitoring timesofisrael

There is a real danger of another international COVID wave this summer, with the Delta variant possibly poised to make a comeback, new Israeli research suggests.

Study suggests repeat home antigen testing for Covid after first negative result

STAT:

Home antigen tests for Covid-19 win for convenience but may not measure up to the accuracy of PCR testing. A new study published in JAMA Internal Medicine explores a different question: how well antigen testing performs over the course of illness.

Researchers followed 225 people who had Covid infections confirmed by PCR testing, as well as their household members. After daily testing for 15 days, home antigen test sensitivity peaked three days after illness onset, at 80% for symptomatic cases and 50% for asymptomatic cases.

BA.2.12.1 Subvariant: Concerning, but No Need to Panic Just Yet A number of factors are contributing to the Omicron subvariant's rise Jennifer Henderson medpagetoday

A new Omicron subvariant is rapidly gaining steam in New York and other parts of the Northeast. Experts are urging caution in the face of BA.2.12.1, and say a number of factors are contributing to its rise. But they're also warning against panic.