CDC Says 36% Of Adults Have Received 1 Dose Of Vaccine

The video discusses the effectiveness of COVID-19 vaccines from Pfizer and Moderna. A study shows that the first dose reduces infection risk by 80% after two weeks, and the second dose increases effectiveness to 90%. The study involved 4,000 healthcare workers and first responders from mid-December to mid-March. Health officials emphasize the importance of receiving both doses for optimal protection.

What is the reduction in infection risk two weeks after the first dose of Pfizer or Moderna vaccines?

• 60%

• 80%

• 50%

• 70%

How much does the effectiveness of the vaccines increase after the second dose?

• 100%

• 95%

• 90%

• 85%

Over what period was the study on vaccine effectiveness conducted?

• March to May

• Mid December to Mid March

• January to March

• February to April

How many health care workers and first responders were included in the study?

• 3000

• 4000

• 2000

• 5000

What do health officials recommend regarding the doses of Pfizer and Moderna vaccines?

• Only the first dose is necessary

• Only the second dose is necessary

• Both doses should be taken

• No doses are necessary