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Infection with the SARS (Severe Acute Respiratory Syndrome)-associated coronavirus results in respiratory failure probably by immunological mechanisms in 10% of patients. Laboratory markers that predict subsequent respiratory failure would therefore be useful in patient management.
We describe the clinical course, hematologic parameters, lymphocyte subpopulations and markers of inflammation in two patients with SARS, i.e., one man with diabetes mellitus and one pregnant woman, infected by the same viral isolate.
The patient with underlying diabetes mellitus developed respiratory failure after admission in the second week of the illness while the second patient developed only a mild disease without respiratory failure. Subsequent respiratory dysfunction was associated with lown umbers of Natural Killer (NK) cells at presentation and elevated CRP levels during the illness.
NK cells and CRP levels at the end of the first week of the disease might be related to subsequent respiratory dysfunction and may link underlying conditions to disease severity.