Search results
Results From The WOW.Com Content Network
Destruction of the last securely stored viruses is an irrevocable action that should occur only when the global community has eliminated the threat of smallpox once and for all. To do any less keeps future generations at risk from the re-emergence of one of the deadliest diseases humanity has ever known.
According to Paul Thacker (writing for the British Medical Journal), some scientists and reporters said that "objective consideration of COVID-19's origins went awry early in the pandemic, as researchers who were funded to study viruses with pandemic potential launched a campaign labelling the lab leak hypothesis as a 'conspiracy theory.'" [34 ...
Young people with polio receiving physiotherapy in the 1950s. The social history of viruses describes the influence of viruses and viral infections on human history. Epidemics caused by viruses began when human behaviour changed during the Neolithic period, around 12,000 years ago, when humans developed more densely populated agricultural communities.
Whether or not viruses should be considered as alive is controversial. [ 35 ] [ 36 ] They are most often considered as just gene coding replicators rather than forms of life. [ 37 ] They have been described as "organisms at the edge of life" [ 38 ] because they possess genes , evolve by natural selection, [ 39 ] [ 40 ] and replicate by making ...
Viruses are small infectious agents that can replicate only inside the living cells of an organism. Viruses infect all forms of life, including animals , plants , fungi , bacteria and archaea . They are found in almost every ecosystem on Earth and are the most abundant type of biological entity, with millions of different types, although only ...
The evolutionary separation from bat viruses is explained in this case by the virus's presence in an unknown species with less viral surveillance than bats. [30] The virus's ability to easily infect and adapt to additional species (including mink ) provides evidence that such a route of transmission is possible.
How viruses do this depends mainly on the type of nucleic acid DNA or RNA they contain, which is either one or the other but never both. Viruses cannot function or reproduce outside a cell, and are totally dependent on a host cell to survive. Most viruses are species specific, and related viruses typically only infect a narrow range of plants ...
Expository writing is a type of writing where the purpose is to explain or inform the audience about a topic. [13] It is considered one of the four most common rhetorical modes. [14] The purpose of expository writing is to explain and analyze information by presenting an idea, relevant evidence, and appropriate discussion.