In a statement just released from the league:

The National Independent Soccer Association is committed the health and safety of the fans of the League as well as the players, staff members and communities. In light of the issues created by the outbreak of COVID-19 (Coronavirus Disease 2019), the League Office and its Board of Governors are suspending the season for the next 30 days effective immediately.
NISA will use this time to monitor this situation in consultation with medical experts and in consideration of the guidelines being put forth by local governments, public health officials and the CDC to determine next steps for moving forward with safe protocol.
We are committed to to being as transparent as possible as this rapidly evolving situation develops and more information becomes available. At the appropriate time, we will provide updates and plans for the continuation of the 2020 Spring Season. We wish everyone health and wellness.

This is a developing story.