Place the following steps in order to describe the path of influenza through the body.
1. The influenza virus enters the respiratory tract.
2. The virus attaches to and penetrates the epithelial cells lining the airways.
3. The virus replicates inside the host cells.
4. New viral particles are released and spread to neighboring cells.
5. The immune system responds to the infection.
6. Symptoms such as fever, cough, and body aches appear.
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Note: This response provides a logical sequence for the path of influenza through the body to ensure clarity and completeness.