<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi ive been out of hospital a week after chest infection as i have copd and this rare bug citrobacter koseri .the drs had never heard of it but even though i have finished all my anti.biotics the dr said i have to stay away from the family .also gave my husband a dose of antibiotics in case he gets it i was wo dering if it is contagious .  <response>: Respected user, HiT hanks for using Chat Doctor.come have evaluated your query thoroughly. Treatment of chest infection has multi modality approach - Antibiotics according to the culture report.- Bronchodilators, decongestants according to the symptoms.- Supportive care of nursing.- Balanced nutritious diet.- Regular walking in fresh air, exercises, YOGA-Avoidance of alcohol, smoking-Sound regular sleep of 7 - 8 hrs.- Avoid exposure to dusty environments, if needed to use face mask Hope to clarify your query Welcome for further assistance Thanks for using Chat Doctor .com giving opportunity to assistWishing fine recovery Regards dear take care 