In short: we need more information from a case study.
Please refer to page 333 and then page 372 of the Biomedicine workbook.
Asthma is often due to External Pathogenic Factor/Influence triggering residual Phlegm in the Lung. Phlegm is the primary factor. This is a more chronic condition.
Whooping cough is caused by seasonal EPI resulting in Phlegm-turbidity causing Lung dysfunction and rebellious Qi. EPI is the primary factor. This is a more acute condition (1-10 weeks).