Safety and Efficacy of ADC189 in Children 2-11 Years Old With Influenza

Patients weigh between 20 to 80 kilograms, given 45 mg ADC189 tablets once; patients weigh over 80 kilograms, given 90 mg ADC189 tablets once.

Patients weigh between 20 to 80 kilograms, given 40 mg Baloxavir marboxil tablets once. Patients weigh over 80 kilograms, given 80 mg Baloxavir marboxil tablets once.

Patients weigh between 20 to 80 kilograms, given 1 tablet of placebo once; patients weigh over 80 kilograms, given 2 tablets of placebo once.

Patients weigh between 20 to 80 kilograms, given 2 tablets of placebo once; patients weigh over 80 kilograms, given 4 tablets of placebo once.

"For patient 5-11 years old, patients weigh between 20 to 80 kilograms, given 45 mg ADC189 granules once; patients weigh over 80 kilograms, given 90 mg ADC189 granules once.~For patient 2-4 years old, patients \<10kg, given 15mg ADC189 granules once. 10kg \~ \<15kg, given 25mg ADC189 granules once. 15kg \~\<20 kg, given 35mg ADC189 granules once. 20kg \~ \<80kg, given 45mg ADC189 granules once."

Placebo. Given once only.

For patients 2-4 years old. Placebo. Given 10 times (5 days, BID).

For patients 2-4 years old. Patients \<15kg, given 30mg×10 times (5 days, BID) Oseltamivir granules. 15kg \~ \<23kg, given 45mg×10 times (5 days, BID) Oseltamivir granules. 23kg \~ \<40kg, given 60mg×10 times (5 days, BID) Oseltamivir granules. ≥40kg, given 75mg×10 times (5 days, BID) Oseltamivir granules.