Lung infections in the elderly that are caused by bacteria or fungi are usually not contagious to the caregiver, but viral infections may be contagious to the caregiver. Lung infections in the elderly are generally not contagious if they are caused by bacterial or fungal invasions, if the elderly do not cough violently, and if the caregiver has a strong resistance and wears a good mask. If the lung infection is caused by a virus, and the old man coughs violently, the saliva may carry the virus, and the caregiver inhales it into the lungs, or the caregiver’s resistance is low and does not wear a mask for protection, it may be contagious. Lung infection in the elderly is recommended to follow the doctor’s instructions for early treatment, to avoid infecting the caregiver, caregiver is also recommended to do a good job of protection, to avoid being infected.