Dr. Anthony Fauci told a caller back in 2004 that the best vaccination for the flu is becoming infected. But Senator Rand Paul had questions for Fauci and expressed concern over what appeared to be Fauci's changing position on immunology and vaccine efficacy after infection.

Dr. Fauci became visibly defensive after Senator Paul asked about guidelines for the previous infection as a variable when deciding if vaccination is appropriate for all Americans to prevent COVID disease. Fauci denied accusations that are responsible for CDC guidelines. Watch the clip to see the exchange.