The White House announced Thursday that President Joe Biden has tested positive for COVID-19 and is experiencing "very mild symptoms," marking the second time a sitting president has come down with the virus. A lot has happened since President Donald Trump was briefly hospitalized with the coronavirus in October 2020. To make sense of how Biden's situation compares with that of his predecessor, USA TODAY caught up with someone who has firsthand experience dealing with a commander in chief with COVID-19. Dr. Jerome Adams, a USA TODAY Board of Contributors member who was U.S. surgeon general when Trump contracted the virus, offered his perspective on what Biden's diagnosis means and what we should expect moving forward. Read the column at usatoday.com/opinion.