I believe Iran is presently unable to accurately report it's cases, since it seems remote villages were infected ~a month ago, and they didn't know. This may explain why Iran's case fatality rate seems higher than elsewhere, since no concerted medical treatment for COVID-19 has been undertaken yet.

China never had the ability to track cases accurately.

Perhaps Italy, South Korea, and Japan are able to track infections they know about accurately, but the asymptomatic spread does not provide confidence that it is possible at all to collect accurate data regarding this pandemic.