Half the world was in summer months when flu season is over, which conveniently is when covid numbers go down. Additionally, there is no standard testing. Cycle thresholds are different province to province and country to country. China requires actual lab tests and only test if you have symptoms. We test people in schools and libraries that are symptom free and healthy. There's no way to determine if a country is responding better or worse since false positives and testing in general is fucked.