Silver said the NBA is watching to see whether the number of new infections decreases, and is monitoring the availability of testing on a large scale and the path toward a potential vaccine and antiviral drugs. The NBA also is paying close attention to what the Centers for Disease Control and Prevention is directing on a federal level and what the various state rules are. On top of that, Silver said health care workers on the front lines have to be “taken care of before we begin talking about NBA players or sports.”