What would a virus do if it caused total extinction?

In summary, viruses have evolved to become more specialized in order to survive and to infect new hosts. A virus's best interest is to infect as many hosts as possible in order to perpetuate its own survival. A virus that is unable to infect new hosts will eventually die out.
  • #1
kasykid
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Ok so I am thinking that it is not in the best interest of a virus to cause total extinction because after that you do not have anything else to infect and sustain your virus cycle.

So isn't a virus's best interest to just infest a host and make it want to reproduce like crazy so it could have more hosts to infect?

What would it do if there is nothing left to infect? Wouldn't it just die and defeat all it's purpose of living inside a host and reproducing to infect others?
 
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  • #2
I'm not sure they think it through. :smile:
 
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  • #3
kasykid said:
die and defeat all it's purpose
Given that there is a virus that is so species-specific, and that that virus is so efficient that it infects all populations of that species, it has just won a Darwin award for itself as well as its host-species. Over-specialization is its own maladaptive trait.
 
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  • #4
Sometimes a virus jumps to a new host. Say ebola to humans. The virus has evolved proteins that hijack the cell's infrastructure, say a fruit bat cell.

When these same proteins attempt to hijack a human cell, things may not go as smoothly. The cell needs to be hijacked, but the host shouldn't die.

The most successful viruses are those that are non-pathogenic. Ebola is already becoming less virulent because the more virulent strains are dying out with their hosts; ebola is evolving as a human virus by becoming less deadly.

So genetic entities with genes that make them go extinct, those generally do not exist for very long. Life has a bias for the exact opposite type of genes.

As for developing a weapon that would kill every individual of a species, that is hard to do. If you don't kill the host fast enough, they have time to fight off the disease with adaptive immunity. If you kill the host too quickly, the host dies before it infects enough people and the virus dies out.
 
  • #5
The influenza virus seems to have found a comfortable niche for itself.
It is highly contagious but usually not fatal to the host, it readily produces minor mutations which don't do much to the virus, but confuse the host's immune system, and is fairly adept in producing mutations that can infect multiple host species.
 
  • #6
Most viruses have a range of host species that it can infect. Some host species are just carriers who suffer no ill effects. One reason so few human viruses can be completely eradicated is that they can live on in other animals. So far, only smallpox has been eradicated.
 
  • #7
So isn't a virus's best interest to just infest a host and make it want to reproduce like crazy so it could have more hosts to infect?

Viruses over time move to establish symbiotic relationships with their host. This occurs naturally. There is no virus we've ever encountered that has 100% infection and mortality rate. Such a scenario is probably impossible due to genetic differences within the host.
 
  • #8
Alcathous said:
Sometimes a virus jumps to a new host. Say ebola to humans. The virus has evolved proteins that hijack the cell's infrastructure, say a fruit bat cell.

When these same proteins attempt to hijack a human cell, things may not go as smoothly. The cell needs to be hijacked, but the host shouldn't die.

The most successful viruses are those that are non-pathogenic. Ebola is already becoming less virulent because the more virulent strains are dying out with their hosts; ebola is evolving as a human virus by becoming less deadly.

Recent events would suggest that this process has not proceeded as far along as one would hope.

Ebola is just one variety of a whole spectrum of viral hemorrhagic diseases, which are unknown by most Westerners, and some of which are so deadly, it is difficult to study them in a lab without taking extreme precautions.

https://en.wikipedia.org/wiki/Viral_hemorrhagic_fever

I wouldn't consider diseases like influenza to be entirely benign, either. The influenza pandemic of 1918-20 came out of nowhere, killed 50-100 million people (between 3 and 5 percent of the world population at the time), and then vanished again, almost as suddenly as it appeared. Who's to say that another great flu pandemic won't come in the future?

https://en.wikipedia.org/wiki/1918_flu_pandemic
 
  • #9
https://en.wikipedia.org/wiki/Names_of_large_numbers
With trillions or quadrillions 1015individuals organism I think math will win, not biology.
7 billions for human,
millions for elephants,
hundreds of thousands for whales,
and if an ant weight around 10 mg and the weight of all ants are heavier than human, there must be around 70 millions ants * 7 billions = 490 quadrillion, 1015 not including other insects and bacterias. With so many parameters the most successful viruses are the ones who compelled not to kill the host too early. Altough I don't know who "compels" them. God? Nature?
Perhaps some viruses infect and kill their host before the host can spread it quickly, so they also vanish. Or there is someone dies from a strain of virus and we'll never know that strain because it also dies along with its host.
 
  • #10
It has been suggested we may already harbor organims that have evolved to form symbiotic relationships with the host. They actually promote longevity of the host to maintain a favorable breeding environment. This is a very fine balancing act. An overpopulated host could be overwhelmed by its symbiots and different hosts would have natural variancess in their tolerance. Sort of like human infestations of earth. A certain number of humans are beneficial to the Earth's ecosystem, but, the law of diminishing returns begins to take over as the number grows excessive.
 

1. How would a virus cause total extinction?

A virus can cause total extinction by infecting and killing all members of a species or by destroying the environment necessary for the survival of a species. It can also lead to extinction by weakening the immune systems of individuals, making them more susceptible to other diseases or environmental factors.

2. Can a virus really cause total extinction?

Yes, a virus has the potential to cause total extinction. This has been seen in the past with viruses such as smallpox, which killed millions of people and was responsible for the extinction of some indigenous populations. However, the likelihood of a virus causing total extinction on a global scale is low and is dependent on a variety of factors such as the virulence and transmission rate of the virus, as well as the ability of humans to develop effective treatments and vaccines.

3. How would a virus spread to cause total extinction?

A virus can spread through various means, such as direct contact with an infected individual, through bodily fluids, or through contaminated objects or surfaces. It can also spread through vectors such as insects or animals. In the case of a global pandemic, a virus can spread rapidly through travel and trade, making it difficult to contain and leading to widespread infection and potential extinction.

4. Are there any viruses that have caused total extinction in the past?

There is no evidence of a virus causing total extinction on a global scale in the past. However, there have been instances where viruses have caused local extinctions, particularly in isolated populations with limited access to medical treatment. For example, the measles virus is believed to have caused the extinction of some indigenous populations in the Americas.

5. How can we prevent a virus from causing total extinction?

The most effective way to prevent a virus from causing total extinction is through prevention and control measures. This includes promoting good hygiene practices, developing and distributing effective vaccines and treatments, and implementing quarantine and isolation measures during outbreaks. It is also important to monitor and track viruses to identify and contain potential pandemics before they become widespread. Additionally, preserving biodiversity and protecting natural habitats can help prevent the spread of viruses from animals to humans.

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