Arch Intern Med
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Simple markers for evaluating the severity of lower respiratory tract infections (LRTI) in primary care are lacking. It is of value to examine whether the information available to the primary care physician during a patient's initial visit can be used to assess the severity of LRTI. ⋯ Preceding aggravation of a concurrent illness and respiratory rate of 25/min or higher, together with an elevated serum CRP level (> or = 100 mg/L), can be used as simple markers for identifying patients with the highest risk for LRTI and improve management decisions among elderly people in primary care.