A White House official said on Sunday that the Biden administration intends to advise all Americans to get a coronavirus booster shot this fall to combat a fresh wave of infections.

Although hospital admissions and infections from the virus are increasing, according to the Centers for Disease Control and Prevention, overall levels are still low, the official claimed.

Moderna announced on Thursday that preliminary evidence indicated their improved COVID-19 vaccine is effective in protecting people against the "Eris" and "Fornax" subvariants.

Moderna and other COVID-19 vaccine makers Novavax, Pfizer, and German partner BioNTech SE have created versions of their shots aimed at the XBB.1.5 subvariant.

Pending approval from health regulators in the United States and Europe, the companies expect the updated shots to be available in the coming weeks for the autumn vaccination season.