Thanks for your question on Healthcare Magic. I can understand your concern. By your history and description, possibility of post infectious bronchitis is more likely in your sister. Bronchitis (inflammation of airways) is common after viral upper respiratory tract infection like common cold. So better to take her to pulmonologist and get done clinical examination of respiratory system and PFT (Pulmonary Function Test). PFT will not only diagnose bronchitis but it will also tell you about severity of the disease and treatment is based on severity only. She will mostly improve with inhaled bronchodilators (formoterol or salmeterol) and inhaled corticosteroid (ICS) (budesonide or fluticasone). Don t worry, she will be alright with all these. Hope I have solved your query. I will be happy to help you further. Wishing good health to your sister. Thanks.