Use Of Procalcitonin Level For Guidance of The Treatment of Suspected Community Acquired Pneumonia

To evaluate the usefulness of serum Procalcitonin level measured to guide the antibiotic treatment of patients with radiographic lung infiltrates.The subjects involved in the study will be divided in two arms ,study arm where the caregivers will know the result of Procalcitonin level and they can change /withheld the antibiotic for the subjects.In other arm only investigators will know the Procalcitonin level. We expect to enroll 100 patients.