EXCLUSIVE — The Biden administration is no longer vaccinating migrants in custody at the southern border ahead of their release into the United States, according to the federal agency and a vaccine provider contracted by the U.S. government.

The federal government rolled back its flu and COVID-19 vaccination operation for migrants who come across the U.S.-Mexico border illegally last September, just as the flu winter season commenced, according to Tom Douglas, vice president of business development and government relations for vaccine contractor Universal Healthcare.