I'm not sure that this is 400 words but this is what I came up with.
Answer:
Most common (as in those appearing in over half of cases) would be polyuria with polydipsia, weight loss, fatigue, and dyspnea. Vomiting is probable too, as well as preceding febrile illness, abdominal pain, and polyphagia.
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The main difference between EHR and PHR systems is that EHR systems are manged by health care providers and PHR systems are used by the patient. The terms EHR, PHR, and even electronic medical record (EHR), are frequently used interchangeably, but are actually quite different.
Ummm, depends which virus?