10 yr old w 15 kids in class out w flu. High fever 102.5, Asthma, 1x Vomit, cough used online dr urged tamiflu.1 dose, now no fever. ShouldTest for flu?

Up to you. Tamiflu will often stop the reproduction of the flu virus in the patient & lead to rapid decline of fever. The response is comforting . However, without conformation you will not know. Flu remains contagious for 7 days from first fever so to know if you need to keep him/her out of school you may need to. Completing a full treatment course with Tamiflu would also still be needed.