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Context The user is curious about the speed at which viruses evolve within a single infected individual. They are interested in knowing whether the mutation process happens rapidly (hours, days) or over a longer period (weeks). They specifically ask whether the type of virus (RNA vs. DNA) affects the rate of mutation. The user also distinguishes between mutation during transmission and mutation within an individual, expressing interest in the latter. They seek insights into the general mechanisms and factors influencing mutation rate during viral infection. Simple Answer Viruses change all the time, kind of like how words get changed when you whisper them down a line. Some viruses, especially RNA viruses, change super fast because they don't have good 'spell checkers'. The type of virus matters a lot; RNA viruses are much quicker to mutate than DNA viruses. This changing happens inside you while you're sick, not just when the virus moves from person to person. Lots of t...

Context This question explores the origins of viruses, the mechanisms behind the emergence of novel viral strains, and the fate of viruses that no longer circulate or cause disease. It touches on the evolution of viruses, their interactions with host organisms, and their potential disappearance from the environment or human populations over time. The question also considers the shift in prevalent diseases over long historical periods, prompting inquiry into the ultimate fate of viruses that were once common but are now absent. Simple Answer Viruses come from other viruses or bits of genetic code. New viruses pop up when existing viruses change a little bit (mutate) or mix with other viruses. They change to survive in new hosts or environments. When viruses die out, they just break apart into tiny pieces. Old viruses disappear because people become immune, conditions change, or they get outcompeted by other viruses. Detailed Answer Viruses, unlike living organisms, don't spontaneous...