President Joe Biden's COVID-19 symptoms 'have improved,' according to a letter the White House released mid-morning Friday provided by Physician to the President, Dr. Kevin O'Connor. O'Connor reported that Biden completed his first full day of the antiviral Paxlovid, after testing positive for COVID-19 on both an antigen and PCR test Thursday morning. 'He did mount a temperature yesterday evening to 99.4 degrees, which responded favorably to acetaminophen (TYLENOL),' the letter said. O'Connor said Biden's symptoms continued to be a runny nose, fatigue - and now a 'loose' cough. 'His voice is deeper this morning. His pulse, blood pressure, respiratory...