How long must you wait until you can play sports again after swine flu?

No fever. One hard and fast rule i like to tell patients is to not play sports when you have a fever. That being said, there's no mandatory waiting period for sports after having the flu, but if you're still feeling fatigued, don't have the same energy - you can expect that you won't perform as well... Your reflexes won't be the same and you'll be prone to injuries.
As long as you need. You have to feel absolutely recovered after an illness like this. I would say when you have none of the symptoms associated with your illness and you feel healthy again, it is safe to gradually return.