Vaccine distribution off to slow start Biden gets his first shot. (AP) What happened U.S. authorities planned to distribute 7.9 million doses of Covid-19 vaccines across the country this week, a massive logistical effort that has been hampered by delays and fierce disputes over which Americans should be inoculated first. Fourteen governors complained that expected shipments of Pfizerâs vaccine to their states had been cut by up to 50 percent, even as the drugmaker reported it had âmillions more doses sitting in our warehouseâ awaiting shipping instructions. Army Gen. Gustave Perna, head of federal vaccine distribution, conceded heâd âfailedâ to anticipate rollout delays, but said the U.S. could still hit its target of delivering enough doses to vaccinate 20 million people by yearâs end. After winning FDA approval for its two-dose vaccine last week, Moderna said it is on track to produce 20 million shotsâenough for 10 million peopleâby Dec. 31.