Influenza virus Nucleus Receptor Epithelial cell The cel engults the virus by endocytosis Influenza vrus beoomes attached to a target epithelial cel New viral particles are made and Viral contents are released. Viral MRNA IS used 10 make vira proteins. released into the extracelular fluid Viral RNA enters the nudeus The cell which is not kiled in the process continues to make new wrus. where it is replicated by the viral RNA polymerase Figure 17.6 In influenza virus infection, glycoproteins attach to a host epithelial cell. As a result, the virus is engulfed. RNA and proteins are made and assembled into new virions. Influenza virus is packaged in a viral envelope, which fuses with the plasma membrane. This way, the virus can exit the host cell without killing it. What advantage does the virus gain by keeping the host cell alive?

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Virus

Viruses are infectious microscopic agents that can only reproduce in live cells of animals, plants, or microbes and are smaller than bacteria. Vertebrates, invertebrates, plants, protists, and fungi are among their many hosts. Viruses are unable to multiply on their own due to the lack of necessary cellular machinery, but they can guide the cell machinery of a host to make additional viruses by infection. The virus enters and attaches to a particular host cell, injects its genetic material, and reproduces by using the host’s genetic material. Viruses cause infection by taking entry into the host cell and using the host cell’s enzymes and raw materials to multiply.