What did researchers in London discover about antibody levels in recovered COVID-19 patients over time?

• Antibody levels remained constant.

• Antibody levels increased significantly.

• Antibody levels decreased significantly.

• Antibody levels were undetectable from the start.

Why might achieving herd immunity be challenging according to the study?

• The virus is not contagious enough.

• The virus mutates too quickly.

• Antibody levels drop off quickly.

• Vaccines are ineffective.

What did Dr. Katie Doors suggest about the antibody response from infections?

• Infections always lead to permanent immunity.

• Infections do not affect antibody levels.

• Infections provide the best-case scenario for antibody response.

• Infections provide a weak antibody response.

What is the current status of the study mentioned in the video?

• It has been peer-reviewed.

• It is not yet conducted.

• It is still under review.

• It has been rejected.

According to Johns Hopkins University, how many confirmed COVID-19 infections have been reported worldwide?

• 20 million

• 5 million

• 10 million

• 13 million