I have had a persistent cough for more the past 2 months. The cough is worse after eating and at night when I lie down. I had a chest X-ray which was normal. What might cause a persistent cough? Ive never been a smoker.
Occasionally I read about an outbreak of listeria from some food source. Most recently it was cantaloupe. Where does listeria come from and who carries it? Is it naturally occurring? Is infection with listeria common?