We conducted descriptive and unmatched case-control study with 1:2 ratio. Active case search and review of medical record of patients’ was conducted. We defined cases as non-improving cough of 14 days or more or cough of any duration with paroxysms or cough of any duration with whoop.  For case control study, 58 Cases were selected using computer-generated simple random sampling. 116 controls selected from the nearest neighbors of cases. Nasopharyngeal swab (NS) samples were taken to identify the etiologic agent. We interviewed participants using a semi structured questionnaire.       