Whooping cough, also known as pertussis or the 100- day cough, In (नेपाली : लहरे खोकी) is a serious respiratory infection caused by a type of a bacteria called Bordetella pertussis ( Gram Negative […]
PathshalaNepal.com is a Registered Company of E. Pathshala Pvt Ltd Nepal. Registration number : 289280
© 2020. All right Reversed.E. Pathshala Pvt Ltd