I can't comment on how effective Iran and China have been at counter-acting COVID-19 but I can give a scathing retort on how my country the U.S. decided to play footsies with the pandemic and leave this country, willfully, underprepared causing tens of thousands of unnecessary deaths due primarily to our ever so "smart" President's reticence in acting proactively to mitigate the viruses spread.
Trump actually went on live TV during press-conference spouting pure BS that "Companies" and some other entities are working to undermine his re-election campaign by pushing the keep the country closed. The rest of the world is closing down to saves, our president is ranting against it because his ego has been bruised (what a joke the U.S. is). Also, lmao, our shit health-system has left us without the necessary logistics to fight such a pandemic as well since it's a largely for profit industry that won't stock-pile equipment and is lead by Administrative stooges who have next to zero practical knowledge about medicine and what is needed to help people.
Long story short, American response to the virus is one big joke for a "first world nation".