Infectious mononucleosis
FILE- In this Sept. 22, 2020, file photo, San Francisco Giants' Brandon Belt throws the ball during a baseball game against the Colorado Rockies in San Francisco. Belt got hit with quite a double-whammy that derailed his offseason: First, in January, he contracted the coronavirus only to immediately become ill again with mononucleosis. Gradually regaining his strength and stamina at last, the first baseman acknowledges he isn't sure he will be ready for opening day with the San Francisco Giants. (AP Photo/Jeff Chiu, File)
Giants 1B Brandon Belt works back from COVID-19, then mono

By Janie Mccauley Mar. 13, 2021 04:56 PM EST