A child with complaints of cough. Characteristic inspiratory whoop. Sample for investigation is ?: (A) Nasopharyngeal swab, (B) Tracheal aspiration, (C) Cough plate culture, (D) Sputum culture
Answer is A. Ans. is 'a' i.e., Nasopharyngeal swab "Culture of nasopharyngeal secretion remains the gold stadard for diagnosis of whooping cough"