A new study shows the persistent syndrome of Covid-19 after-effects known as long Covid can develop after “breakthrough” infections in vaccinated people. Other new findings suggest a gene that helps the coronavirus reproduce itself might contribute to life-threatening Covid-19 in young, otherwise healthy people.

Evidence is emerging that not only can Covid-19 vaccines help prevent long Covid, but they could serve as a form of “rescue” for those already stricken with the condition.

Illinois will require all eligible students and school employees to be vaccinated and re-instituted an indoor mask mandate under an order announced by Governor J.B. Pritzker on Aug. 26.

Some 25 percent of SARS-CoV-2 infections among Los Angeles County residents occurred in fully vaccinated residents from May through July 25, a period that includes the impact of the highly transmissible Delta variant, U.S. officials reported on Aug. 24.

The mRNA vaccine from Pfizer and BioNTech may be less effective than Moderna’s against the Delta variant of the coronavirus, according to two reports posted on medRxiv on Aug. 8 ahead of peer review.