Here is some of what the CDC said recently:
They have instructed officials to report deaths where the patient has tested positive or, in an absence of testing, "if the circumstances are compelling within a reasonable degree of certainty." (The quotation marks are a direct quote from the CDC). There are telltale medical signs when this virus is present even if a test is unavailable.
Why are they saying this? Because there are many deaths described as influenza or pneumonia where tests are not available. The rate of death suggests that there is more going on than the historical rate from influenza and pneumonia. This is happening in rural areas again, due to the lack of testing.
The article that is read is not related to the Mayo Clinic to which HawkPredator is referring but they may be following a similar protocol when testing is not available.