The replication cycle of the influenza virus consists of six stages:
1. **Attachment**: The virus binds to receptors on a target epithelial cell.
2. **Penetration**: The host cell engulfs the virus through endocytosis, enclosing it in a vacuole.
3. **Uncoating**: The viral envelope and contents are released from the vacuole.
4. **Biosynthesis**: The viral RNA enters the nucleus, where it is replicated by RNA polymerase.
5. **Assembly**: New viral particles are assembled.
6. **Release**: The newly formed viral particles exit into the extracellular fluid, leaving the host cell alive to continue virus production.

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Influenza, commonly known as the flu, is a common viral disease caused by an orthomyxovirus that primarily affects the upper respiratory tract.

Influenza

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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