The extension comes as the rate of new U.S. vaccinations continues to slip. The U.S. averaged about 800,000 injections per day last week. That’s down from a high of nearly 2 million per day two months ago. President Joe Biden’s goal is 70 per cent of American adults partially vaccinated by July 4. The CDC says about 64 per cent of Americans 18 and above have received at least one dose.