Dr. Frank Rhame, an infectious disease specialist with Allina Health, said this recommendation, however, does not mean that vaccines aren’t working.
"These vaccines are very effective in preventing what we care about the most, which is serious illness and death," he said.
Dr. Rhame said data shows antibody levels can drop over time, leading to more breakthrough infections. However, most people remain protected against serious illness.
WCCO TV News also reported on this story.