Our immune system’s job is to protect us against foreign invaders, including respiratory viruses such as COVID-19, Flu and RSV. On September 4th of this year, 72 year old First Lady, Dr. Jill Biden, for the second time tested positive for Covid-19. Mrs. Biden initially tested positive for this virus in August 2022. Might her immune system be less than optimal, placing her at greater risk and making her more vulnerable to respiratory viruses and COVID-19?