CNN News:美国疫苗供应不足 分发陷危机

The U.S. Centers for Disease Control says 9 million people in American have gotten a first shot of coronavirus vaccine. There are two different vaccines that have been approved for emergency use in the U.S. And regardless of whether people get the one made by Pfizer and BioNTech or the one made by Moderna, health officials say two doses are needed to maximize the drug's effectiveness.
Manufacturing hasn't been as fast as some experts expected. And states have reported problems distributing the vaccines through hospitals and doctor's offices because some of these places say they don't have enough workers to both care for their patients and serve as vaccination clinics.

So the U.S. government is changing some of its guidelines. It wants more pharmacies to be able to give vaccines. It's planning to help states set up mass vaccination sites if they ask for government assistance.
It's going to allow anyone over age 65 to get the vaccine immediately where it's available. And both the Trump Administration and the incoming Biden Administration want to release all available doses immediately instead of holding half of them back to ensure that people who've already gotten the first dose will be able to get the second on time.
The benefit is that this will make more vaccines available in the short term. The drawback is that it risks people not being able to get their second dose when health officials say they should have it. There have been some side effects including several cases of dangerous allergic reactions associated with the vaccine. And several polls have indicated that at least 40 percent of Americans do not plan to get vaccinated against COVID-19.