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Secondary bacterial infections of the bronchi is an opportunistic infection where the normal bacteria that live in the nasal/oral region of the pharynx are able to infect the lungs. This usually occurs following a viral infection since the virus typically infects and kills the cells that make up interior lining of the bronchioles. This then causes a breach in this barrier which allow the bacteria to invade the tissues underneath and cause a response (bronchitis) by the immune system. Secondary bacterial infections of the bronchi is an opportunistic infection where the normal bacteria that live in the nasal/oral region of the pharynx are able to infect the lungs. This usually occurs following a viral infection since the virus typically infects and kills the cells that make up interior lining of the bronchioles. This then causes a breach in this barrier which allow the bacteria to invade the tissues underneath and cause a response (bronchitis) by the immune system.

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