Is humanity accidentally selecting for vaccine-resistant traits in viruses?
Is humanity accidentally selecting for vaccine-resistant traits in viruses?
I was thinking about vaccines and their usefulness, when it occurred to me that, in using vaccines, we've sort of pigeonholed viruses into behaving the way covid does. Haven't we?
If a virus is slow-mutating or distinct enough, then it goes the way of polio or smallpox - that is, nearly or completely eradicated from the world, especially in countries wealthy enough to vaccinate en masse.
So the only kind of viruses that are capable of thriving for very long are those that spread fast, and therefore mutate fast enough that vaccines can "miss" like they do sometimes with the flu. And if a virus maintains lethality above some socially-determined threshold, people take it seriously enough to isolate and kill it off. So it kinda feels like humanity "made" covid, not in a lab, but sort of by default, by killing all the other behaviors of treatable/preventable plagues that could have existed.
Are we setting ourselves up for more fast-moving covid-like viruses in the future, by vaccinating the way that we do?
I guess for this to be any evidence toward changing our practices, it would have to be the case that there's a viral "ecosystem" in which vaccinating against one virus makes more room for others, and I don't know if that's true.
Are covid-like viruses simply an inevitability, or could a change in practice have reduced the likelihood of such a thing happening?
So, I'm not a virologist, so I can't answer about viruses. But I am a bacterial microbiologist, so I can talk a bit about pathogenic bacteria. Short answer: yes. Long answer: yes, kind of.
It really depends on what the vaccine is targeting and what the pathogen is. My favorite pathogen is Streptococcus pneumoniae, the leading cause of pneumonia. So let's look at it from that perspective. There are vaccines for S. pneumo, but the vaccines only target certain stains of S. pneumo. And every 5 or so years, we make a new version of the vaccine because the types of S. pneumo that are causing disease keeps shifting. If the vaccine accounts for type A, then type B starts to cause more disease. If the vaccine accounts for types A and B, then type C starts to cause more disease. If the vaccine amounts for types A through C, then type D starts to cause more disease. Repeat ad nauseum.
So yes, we can cause shifts in pathogen populations through vaccines. This is evolution, in its strictest definition. That being said, there's a lot of caveats. First, that doesn't mean that vaccines are bad. Maybe we want to shift the population (for instance, toward a milder form of the disease). Or maybe it doesn't strictly matter if the shift occurs (if we can just keep making new vaccine versions, a la S. pneumo).
Second, even though vaccines may be shifting the population, that doesn't mean that it doesn't work. The S. pneumo vaccine significantly decreased infection and mortality from pneumonia. And while a lot of people still die from pneumonia today, it's nothing compared to the mortality before modern medical science.
Third, it really depends on the vaccine. Specifically, how hard is it for the pathogen to mutate that portion that the vaccine is attempting to mimic? There are certain proteins that are more difficult to mutate than others. For instance, there are certain proteins that are involved in binding to and attacking the host. These proteins tend to be somewhat difficult to mutate, since mutating those proteins tend to also make the pathogen less efficient at attacking the host. If the vaccine trains the immune system to recognize these proteins, it can be really difficult for pathogens to evolve away from these proteins. Not to say that it's impossible for pathogens to evolve anyways (pathogens are surprisingly tricky), but a well-designed vaccine, along with good adoption in the population, can significantly hinder a disease.
Quite an interesting read! Thanks for your input :)
So I'm not a virologist by any stretch, but I do work with computer systems as a profession and think there's a comparison to be made.
In replicating any given bit of data there's always the potential for errors. With computer systems there a checks in place but for living systems no so much. The more complex the data amd the more times it replicates the greater the raw chamce to have a particluar bit in the code get scrambled.
So if you have a fadt breeding bug that's a longer string of RNA than some other the chamce for variants is greater. For viruses, lethality is a byproduct rather than a feature, but since the virus itself has no cognition or control over the outcomes of these fliped bitsthere is an entirely random chance that any given error in the code will either be beneficial, neutral, or deteimental to the propagation of the virus.
To get to what I think is the original question here of 'did humans create this condition' I would suspect the answer is no then. For comparison, we still have the 'common cold' which changes with the year but there's never been a vaccine of any meaningful sort issued for it. This particular parent corona virus started off with an abnormally high mortality rate compared to other similar class viruses but seems to have shifted in the last several itterations to a less dangerous (at least in the immidiate semse, long term maybe not) but more rapidly and readily spread form.