The history of human is markedly long. consequently how come we do not hold contageous deseases from millions years ago.?

Homo sepiens history is millions of years. then how come we do not enjoy contageous desease from millions of years ago. all the harshest contageous desease heppend contained by couple decades. and they likely to remain contained by our specie's gene pool. such as HIV. how come it didnot exist from millions of years ago. if its transmitted from monkey. we ate more monkey millions years ago. it is very mysterious. since some desease approaching HIV will likely to stay contained by our specie in the adjectives but non have stayed since millions years ago. and we did not even enjoy medication for cure millions years ago. isnt it interesting? can new desease still come about to human all the sudden? and why does it come up? if HIV existed millions of years ago wouldnt we all be extinct? or in fact medication to prolong life is bleak effect to the society as whole? because its produce more people to be contaminated and not die intrinsically. anybody know the answer ?

Answers:
Due to differences of diversity of the human race, and the flora and fauna arond them, some diseases are localized with the sole purpose in trustworthy areas, and due to genetic diveresity over time, people can develop immunity to certain diseases.

For example, it's be discovered that certain descendants of Scandinavians/Vikings are HIV immune.

It's for reason like this that genetic diversity is such a appropriate thing, and why imbreeding is so frowned upon.

It's call evolution. Yes even the bugs evolve.

1st

.. it's because of evolution ..

2nd

.. nasty scientist

virus and diseases mutate to better survive in their environment. so we can still seize new diseases and find ways to cure elder diseases. diseases from years ago just mutated into ones we see today.

The humans who survived these epidemics within prehistoric times possessed genetic traits that made them less susceptible to these bugs. As these organisms survived and successfully reproduced, they passed their genetic resistance on to their daughter, so that genetic resistance to these diseases grew with respectively passing contemporaries.

So as not to anger the religious community, I can give the theoretic reasoning.
The best example is the flu virus. Sure, we hold antibiotics that were and are forceful means to punch-up the organisms, but the organisms evolve as man, animals, fish, and insects evolve.
At the present, the big fear is the bird flu virus. Just resembling all the resembling viruses, they grounds the same symptoms as a familiarized subject flu named the Hong Kong Flu (HKF). This flu kill many inhabitants worldwide in the sixties; consequently it sort of hid.
Some scientists believe the adjectives flu viruses evolve to different looking organisms. A satchel in point is the H5N1 bird flu. It have an ancestor virus that was eradicated, but not defeated. It is much approaching a cancer going into remission; it is not cured and many times will re-emerge.
There is righteous evidence the H5Ni is a mutant of another virus thought eradicated, but not defeated.
A virus is like a computer virus, contained by a way. The computer virus wills verbs to change and convert. It is due to the codes that are assigned to it. The virus will act surrounded by the same carriage, the DNA will evolve or mutate.
Now back to the bird flu. Scientists realize the DNA of a virus can move as medications are introduced.
Think of it this route; if you keep cattle within a fence that have been electrified, the reasoning is the cows will remember the shock.
If you bombard the flu virus near certain antibiotics, the DNA will lead to it to change, thus making the trustworthy antibiotic to be useless.
Scientists don't have a clue as to how the H5N1 bird flu will mutate; but if it mutates to end in it to be susceptible to humans, we will have a pandemic.

The entire process of evolution took place not wihout infectious diseases but newly because of them.Several years ago more young species of Homo sapiens died and become extinct because of rampant infections for which only "nature"supplied medication.The "fittest"survived and evolved further single to be infected with another set of "mutant"germs.As humans become more and more resistant to infections ,germs became "more"and "more" virulent.(germs also "evolve" to safeguard themselves from human "enemy" call " immunity.").

We do enjoy contagious diseases from millions of years ago. We evolved, they evolved, one unbroken chain of sniffling and sneezing.

The crazy ancestor of HIV causes no problem to the chimps that own it, it will most likely evolve into a commonplace relatively benign strain the mode many virus do. Most viruses don't create overt diseases, we only reimburse attention to those that do.

An infectious disease organism that kills bad it's host species is essentially committing suicide. Many epidemics start off beside a super aggressive organism that infects easily and kill a large portion of its hosts.
As the epidemic spreads, smaller amount aggressive, less toxic strains emerge.

It's in a disiese cause organisms best interest to not kill it's host because it allows greater opportunity for reproducing and spreading itself. Very deep infectious diseases tend to be newly evolved variation.

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The history of human is markedly long. consequently how come we do not hold contageous deseases from millions years ago.?

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