Herpesviruses and some hepatitis viruses persist. The host pays in immune surveillance; the virus pays in needing that host alive. Surviving or being vaccinated leaves antibodies and T cells. That memory is why second measles is rare in immune people. (17)
A virus particle is not a cell. It has no ribosomes, no independent metabolism and no binary fission. The genome is DNA or RNA, wrapped in a protein capsid, sometimes plus a stolen host membrane. That poverty of parts is why viruses must enter a host. They are best pictured as instructions that borrow a living factory, not as tiny animals swimming in blood.
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Herpesviruses and some hepatitis viruses persist. The host pays in immune surveillance; the virus pays in needing that host alive. Surviving or being vaccinated leaves antibodies and T cells. That memory is why second measles is rare in immune people.
A virus particle is not a cell. It has no ribosomes, no independent metabolism and no binary fission. The genome is DNA or RNA, wrapped in a protein capsid, sometimes plus a stolen host membrane. That poverty of parts is why viruses must enter a host. They are best pictured as instructions that borrow a living factory, not as tiny animals swimming in blood.
Once you drop the idea that a virus is a 'small bacterium', vaccines, antibiotics and 'killing germs' stop being interchangeable words. No cytoplasm programme for making ATP or protein. The particle is a genome plus a delivery shell.
Baltimore classes sort viruses by nucleic acid and how they reach mRNA. A given family uses one strategy, not both at once as the main genome. Icosahedral or helical protein coats, assembled from repeated subunits — a geometry first mapped on tobacco mosaic virus and poliovirus.
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Next question: Antibiotic resistance · Open the topic: Viruses
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