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Virus factors encoded in the genome often control the tropism, routes of virus entry, shedding and transmission. In polioviruses, the attenuating point mutations are thought to induce a replication and translation defect to reduce the virus' ability of cross-linking to host cells and replicate within the nervous system. [12]
As the virus bends the plasma membrane it begins to wrap around the whole capsid until the virus is no longer attached to the host cell. Another common way viruses leave the host cell is through cell lysis, where the viruses lyse the cell causing it to burst which releases mature viruses that were in the host cell. [3]
Some viruses can "hide" within a cell, which may mean that they evade the host cell defenses or immune system and may increase the long-term "success" of the virus. This hiding is deemed latency. During this time, the virus does not produce any progeny, it remains inactive until external stimuli—such as light or stress—prompts it to activate.
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Virions of some of the most common human viruses with their relative size. Nucleic acids are not to scale. SARS stands for SARS-CoV-1 or COVID-19, variola viruses for smallpox. Basic structural characteristics, such as genome type, virion shape and replication site, generally share the same features among virus species within the same family.
President Trump devoted Monday’s briefing of the coronavirus task force to countering the growing public perception that his administration was slow to respond to the virus that has sickened ...
Viral evolution is a subfield of evolutionary biology and virology that is specifically concerned with the evolution of viruses. [1] [2] Viruses have short generation times, and many—in particular RNA viruses—have relatively high mutation rates (on the order of one point mutation or more per genome per round of replication).
Campus police are scanning hundreds of images and using facial-recognition technology to identify the attackers. Similar tools were used to identify Jan. 6 attackers.
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related to: common assault points to prove a virus