This is the e-mail I sent:
Heads up - Puck has been feeling poorly since about noon yesterday. He's had a low grade fever, is feeling achy, is not very hungry and has thrown up twice. He's also complaining of headache. He's managing to eat a little and is keeping up his fluids. He's also been very tired and sleeping a lot. I understand one of his school friends has been vomiting since yesterday as well - I suspect it's just a stomach bug. Given it's after six now and he's still got a temperature, I don't want to send him to school tomorrow. Please confirm you're able to take him in the morning and I'll drop him to you before work. If he still has a fever tomorrow he should likely see the doctor to check for signs of infection or other issues.