I’ve talked about this before but this video does a good job of explaining how to know if you’re good to continue working out while you’re sick or if you should just stay home.
Related: How to train when you’re sick … as a rower
Like they said, it’s better to lose a small amount of gains by taking time off when you first start feeling sick than it is to prolong your illness by continuing to workout, which can ultimately end up costing you more in the long run.