Who can get a third COVID-19 vaccine dose?

[Fox 9 News, August 15, 2021] The FDA has given the go ahead for a select few to receive a third dose of the Pfizer and Moderna COVID-19 vaccines. Who exactly can get the third dose and why? Allina Health vice president for medical specialties, Dr. Venkat Iyer, talked with Fox 9 News about the new development.