Dr. Anthony Fauci, the country’s top infectious disease expert, will throw out the ceremonial first pitch at the first game of Major League Baseball’s pandemic-delayed regular season. The Washington Nationals announced Fauci accepted the team’s invitation to have the pregame honor Thursday. He is a self-described fan of the reigning World Series champions. The Nationals host the New York Yankees to open the season nearly four months after it originally was scheduled to begin.