WASHINGTON — The Biden administration on Tuesday formally began allowing Americans who had ordered free coronavirus tests this winter to request a second round of four tests per household, through the same U.S. Postal Service program that President Biden unveiled in January.

The move, which Mr. Biden had promised last week during his State of the Union address, followed a crush of interest in the program when it debuted in January. At the time, case rates had skyrocketed because of the Omicron variant and tens of millions of households scrambled to obtain the free tests.

6 Months of U.S. Data Support Safety of mRNA COVID Vaccines CDC reports find that most AEs were minor, transient, and few patients sought medical care Molly Walker medpagetoday

Nearly all local and systemic adverse events (AEs) reported after Pfizer or Moderna's COVID-19 vaccines were mild and transient, and only a fraction of individuals reported seeking medical care, according to data from the Vaccine Adverse Event Reporting System (VAERS) and CDC's v-safe tracker.