What Motivates Germs to Infect Our Bodies?

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Discussion Overview

The discussion revolves around the motivations of bacteria and viruses to infect human bodies, exploring concepts of evolution, natural selection, and the relationship between humans and microorganisms. Participants examine whether germs have motives, what serves as food for these organisms, and the implications of their interactions with humans.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question the notion of "motive" in the context of bacterial and viral infection, suggesting that these organisms evolve randomly under natural selection pressures.
  • It is proposed that the ability of a germ to replicate determines its success, and that excessive virulence can lead to the extinction of the pathogen if it kills its host too quickly.
  • One participant highlights the presence of beneficial bacteria in humans, indicating that not all germs are harmful and that humans can leverage these microorganisms for their advantage.
  • Another participant emphasizes that the term "motive" is a misinterpretation of evolutionary processes, clarifying that there is no conscious intent behind the actions of bacteria and viruses.
  • There is mention of how environmental conditions can influence the virulence of pathogens, with examples such as cholera evolving toward less virulent forms in improved sanitation conditions.
  • A participant expresses curiosity about what exactly serves as food for bacteria when they invade human bodies, drawing a parallel to predatory behavior in animals.

Areas of Agreement / Disagreement

Participants generally disagree on the concept of motive in the context of germ infection, with some asserting that there is no motive while others explore the idea of bacteria seeking food. The discussion remains unresolved regarding the motivations and behaviors of microorganisms.

Contextual Notes

The discussion includes various assumptions about the nature of evolution and the relationship between humans and microorganisms, which may not be universally accepted. The implications of environmental factors on pathogen virulence are also noted but not fully explored.

mktsgm
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I wonder what could be the motive for a bacteria or a virus to invade our body. If it finds food in us, what serves as food?

What would have happened to that particular germ, had it not infected someone?
 
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There is no motive. Bacteria and virus evolve randomly, under natural selection pressures. Whatever allows a bacterium or a virus to replicate will stick.

There is also a limit to infection. If an infection is too strong and kills its host before it can replicate and infect someone else, it will go extinct.
 
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Humans have large number of friendly bacteria on the skin and in the gut. So not all germs are bad. Dr Claude's explanation is right on. You can google 'host parasite' and 'symbiosis' see what all of this is about.
 
DrClaude said:
There is no motive. Bacteria and virus evolve randomly, under natural selection pressures. Whatever allows a bacterium or a virus to replicate will stick.

There is also a limit to infection. If an infection is too strong and kills its host before it can replicate and infect someone else, it will go extinct.
This wikipedia post elaborates a bit on this.

It is also interesting that by controlling environmental conditions, virulency (how nasty diseases are) of pathogens can be changed via evolution.
For example, Cholera can be influenced to evolve toward less virulent forms when water sanitation is improved (see question #5).

Using "motive" as a quick term for a direction evolution takes is a common, but incorrect, interpretation of what is going on.
There is, of course, no mind with a goal and no plan to do something before it happens.
 
That viruses and bacteria can affect humans, for better or worse, is really a chance outcome. We can only utilize or be invaded by less than 1% of known viruses and bacteria. Bacteria are essential to human life, we are the ones most motivated to use them to our advantage. There are many species of both but very few in comparison are actually pathogenic.

What happens to them depends upon all sorts of conditions.
 
Thanks to all who have taken pains to answer my question.

A lion preys on a deer for it is its food. Similarly I would like to know when a bacteria invades a human body, is it seeking its food?

If so what exactly is its food in our body/cells?

This is my question.
 

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