関連ワード:  can the flu develop into bronchitis    can the flu turn into bronchitis    can the flu turn into bronchitis or pneumonia    can the common cold turn into bronchitis    does the flu turn into bronchitis    can the flu turn into bacterial bronchitis    can a common cold develop into bronchitis    how fast can the flu turn into bronchitis    does the flu always turn into bronchitis    can stomach flu turn into bronchitis