According to PORT's criteria, 130 cases (90.28%) with low risk level (included 43.75% cases of risk group I, 35.42% cases of risk group II and 11.11% cases of risk group III) were treated at outpatient department and 14 cases (9.72%) with average and high level (included 8.33% cases of risk group IV and 1.39% cases of risk group V) were hospitalized for intensive care. On the other hand, most of risk factors of CAP had no any relation to pathogenic agents.