Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Bronchitis? ?
    ### Response:
    Bronchitis is a very common condition. Millions of cases occur every year.
                
Elderly people, infants, and young children are at higher risk for acute bronchitis than people in other age groups.
                
People of all ages can develop chronic bronchitis, but it occurs more often in people who are older than 45.
    