[alyx]

Okay so following your analogy, viruses are like subcomponents of an engine.

How are subcomponents of an engine moving in space without ever exerting energy? I can imagine how this can happen infrequently but can't see how this propagation (movement without energy) is sustainable.

[space_fountain]

They’re like seeds in the wind. This also means most viruses will never infect a cell. Maybe thinking of them like infected usb drives strewn across the ground hoping some unsuspecting cell picks them up will help.

[fsckboy]

>They’re like seeds in the wind.

I like this analogy, I'll just take it a bit further: they are seeds in the wind where the wind is a snuffly and moist sneeze aaachoooooo, spraying the seeds all around.

some viruses can sit and survive on a door handle and get passed that way (your hand on then handle, then you rub your eyes) This is called "fomite transmission". Other viruses cannot survive sitting on a door handle outside of your body. The HIV virus can only be passed directly from one person to another in moist body fluids, and not "through" normal dry skin. From this we can see why cold and flu spread so easily, and even though HIV does not, it still has very little trouble finding pathways to transmit.

early in Covid, it was unknown how it spread. In certain ways we still don't know. Do masks work? A lot or a little? the whole thing became so politicized it's still hard to get good information.

[imchillyb]

> Do masks work? A lot or a little?

I truly don't believe this is the relevant question.

The questions society should be asking is this: "What percentage of the populace properly handles and dons masks? What percentage of the populace replaces or washes those masks thoroughly enough to prevent transmission? What percentage of the populace refuses to don a mask?

Answering these questions truthfully would provide a better coverage graph and allow researchers to find ways to increase the coverage and educate the public accordingly.

[fsckboy]

I was not trying to answer or even ask the mask question, I was using something the newbies (to virology) here would already be familiar with to point out that even though we know a good bit about viruses, experts still don't automatically know things like "how does this virus propagate", it takes time to tease out the answers and they don't always come.

It's a bit like yesterday's story here about massive amounts of evaporation of water occurring by a mechanism that science never knew about, just to point out that there is much to know that we don't know yet, and not to go deeper into evaporation where science is already struggling.

[autoexec]

> "What percentage of the populace properly handles and dons masks? What percentage of the populace replaces or washes those masks thoroughly enough to prevent transmission? What percentage of the populace refuses to don a mask?

While those questions are somewhat useful, ultimately masks still help in any case.

If half the population doesn't wear a mask, masks won't work as well as they would if 100% of the population did, but they would still make a difference. If people don't wear or care for masks correctly it still doesn't make those masks useless because putting literally anything in front of somebody's virus spewing face holes helps a lot regardless.

This is why we teach children to "vampire cough", not because every single person on earth is going to do it 100% of the time, or because people's elbow pits provide N95 levels of protection, but because neither of those things is necessary for it to make a massive difference in the spread of illness.

[dylukes]

Sheer random chance.

I had this same question while working on structural resolution of a certain RNA polymerase.

I asked "okay so if this ratcheting mechanism allows the protein to zipper along the nucleotide strand... what's pushing it along?"

The answer is that nothing is pushing it along. It's just random movement and enough time (milliseconds) plus a ratcheting mechanism to ensure it doesn't go backwards.

Our low level processes are not so different from viruses in this respect!

[jagraff]

Movement without energy is possible due to diffusion. Imagine you had a room with cellophane separating one side from another. Each side has a different gas, but both gasses are at the same pressure and at room temperature. Then, the cellophane is removed. Without adding any energy to the system, these gasses will mix until the whole room is a perfect mixture of the two gasses, simply because they both diffuse through the entire room. Something similar happens to allow viruses to move through your body (and, if they can be aerosolized, through the air).

[IIAOPSW]

Using the analogy, they are like loose screws or other basic machine parts that fell down the pipe, got in the engine, jammed a bunch of things cause they aren't supposed to be there, and consequently a bunch more misc scrap metal got sneezed out the exhaust pipe.