Pfizer said in a statement that there is “no data” to prove that a single dose of the coronavirus vaccine can provide protection against infection after 21 days.
Why it matters: The UK announced on Wednesday that it will change its vaccination strategy to “provide the first dose to high-risk groups instead of providing the required two doses in the shortest possible time.” Certain provinces in Canada are doing the same.
- Pfizer responded to this, confirming that although some protection seems to begin as early as 12 days after the first dose, the two doses of vaccine (three weeks apart) are the only program that has proven to be 95% effective in phase 3 clinical trials.
- The British government added in a statement: “Everyone will still receive the second dose, which will be within 1
Big picture: Pfizer has issued a warning that many countries, including the United States, are arguing how to deploy the vaccine in the most effective way. The pace of the United States will be significantly lower than its target of vaccinating 20 million people by the end of 2020, and as of Wednesday night, only 3 million people have been managed.