From the Winston-Salem Journal today:

The district will be recruiting teachers for all grade levels, as well as substitutes and support staff, such as bus drivers, custodians and child nutrition workers.
The district has a pool of more than 900 subs, with about 250 of those trained on Canvas, the online learning platform.
Many in the sub pool have not been willing to learn Canvas; others are in the high-risk category as it relates to COVID-19, Bonner-Reed said.
The number of teachers in quarantine is expected to increase as more students return.