David's presentation does the job just fine. The problem of scanner precision. The problem of under-reporting and late reporting. That means that such cases were underreported or reported late. The problem of complete absence of proactive value.
Viruses can spread much faster that updates to the list.
Often it is seriously misrepresent the situation. For example if a new type of virus appears it will not be promptly reported. As everybody know the Concept virus took the world by surprise. The problem of limited value as a prevalence table. Purging the viruses from the list is even more arbitrary than their inclusion, so the list cannot be used as a reliable prevalence table.