answer no. 3??
respiratory diseases caused by virus.
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Bronchitis
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Answer: Bronchitis
Explanation: bronchitis is caused by an infection, usually with a virus. Influenza (the "flu" virus) and the viruses that cause the common cold are the most frequent culprits. Occasionally, acute bronchitis is caused by a bacterial infection, particularly with Chlamydia pneumoniae and Mycoplasma pneumoniae.
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