In 14th century bubonic plague (black death), how come the virus disappear?
Or they just invented unknown Vaccines?
- RichardLv 62 months ago
It killed the weaker and the stronger survived. Survival of the fittest in action.
- 2 months ago
It didn't disappear. They had a bad outbreak in London in the 1660s and in Russia in the 1770s.
- Christin KLv 72 months ago
Cold weather, and fire. Fire was used to dispose of bodies, burn homes where people had died and villages where the disease had taken hold. What that fire did was destroy food supplies for RATS--which destroyed FLEAS which were the insect that spread the disease. Cold weather killed more fleas. As the rat population decreased, so did the plague. But there was not only one outbreak.
It is worth to note that there was never a vaccine. Bubonic plague can still be contracted, and still is in some parts of the world, including in the US. Plague can be treated with antibiotics now, so if it is contracted, it's not 100% fatal. Ridding areas of rats also keeps plague under control.
- ClickmanLv 42 months ago
some good answer here. the answer is data and analytical thinking
simply nature finds ways to cull the weak of all species and each strives to survive
virus for example are a species trying to survive
a host that dies is not a good host but it finds those who are good host while killing the rest
humans are a species with the inborn will to survive,, but analytical intelligence is our key to survival but also our self destructive behavior - use of knowledge and power must be used wisely
as we loose instinct we must learn to be more intelligent .. a problem because
some of us have gain the ability to think.. others are just riding along
as the survival rate is increased by the productive the unintelligent masses reproduce and survive yet do not think , thus over reproduce
the other parts of nature take advantage of that - this balance is natures way to cull those who over reproduce be that rabbits or people
if you go to the amazon jungles take tribal person out of the jungle he will benefit from the medical foods and comforts, he will not be a productive member for the most part of society. But after one generation he no longer can go back to the jungle and survive
if you look at the manner people die in most areas of the world you will see different causes of death as the dominating cause.
and the top contributor is malnutrition in many nations. people producing more people than they can produce food. and production of food is not the only part storage transportation is the big 3 of that food access.
So the instinct to breed in numbers as a survival method also ends up being the main cause of death -- virus attack the weak and bacteria and infections attack the weak etc.
in china the lack of food is a big problem and they eat almost anything they can kill, This is the cause of the problem there and much of the world ..
it is easy to say redistribution of foods from the other areas.. to a point sure,. but transportation cost of same and storage is still a problem. a problem not solved with good intentions.
as we help the weak survive the point Gray Bold made on genes kicks in and while we do not like the deaths, we are sad to say in need of this cleansing
Until birth control is more widely used and planed living by individuals not by tyranny of government is the norm, this kind of epidemic will occur
sad but the well meaning share the bounty people are the biggest contributors to the problem.
I will tell you, there are too many over educated people but not enough intelligent people
knowledge and wisdom are the key not formal education certificates (example the grammar police often miss the point here but blame the spelling) ELITISM
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- Gray BoldLv 72 months ago
The Black Death didn’t just wipe out millions of Europeans during the 14th century. It left a mark on the human genome, favoring those who carried certain immune system genes. Geneticists know that human populations evolve in the face of disease. Certain versions of our genes help us fight infections better than others, and people who carry those genes tend to have more children than those who don’t. So the beneficial genetic versions persist, while other versions tend to disappear as those carrying them die. This weeding-out of all but the best genes is called positive selection.
- curtisports2Lv 72 months ago
Viral and bacterial infections always run out of steam. They need continual new hosts to infect to keep going, so they tend to mutate to a weaker form so that they aren't so lethal that they kill every host they infect and run out of hosts that way. At the same time, some people are able to withstand the infections and recover and develop immunity, thus setting up a protective barrier for others. That slows down the rate of transmission. It is known as the 'herd immunity'. This can take years with bacterial infections. It usually takes less time with viruses, however, viruses constantly mutate to different strains of the same virus and will always keep coming. This is why there is an annual 'flu season' and people should get an annual flu shot - which is not a guarantee against illness. I have gotten the shot every year for the last fifteen or so, and this is the first year it didn't work. I caught Type B. Doctor said the shot was only 40% - 60% effective this year. The developers are playing a constant guessing game as to what is going to come out of Asia, the source of the vast majority of viral infections.
- Anonymous2 months ago
The most popular theory of how the plague ended is through the implementation of quarantines. The uninfected would typically remain in their homes and only leave when it was necessary, while those who could afford to do so would leave the more densely populated areas and live in greater isolation.
- 2 months ago
The 4 years black death itself lasted killed of around quarter of Europeans,
and was directly setting the world for "second plague epidemic" it kept pooping up annually until around 17th century.
Forcing few things:
improved hygiene amongst stricken nations, and other nations that tried to avoid having to deal with an outbreak, the viruses themselves slowly mutated into less lethal variants, and heard immunity took effect - essentially those who survived the (presumingly less fatal string) build up antibodies to deal with any subsequent contracting of the virus and its mutations (at least ones that were close enough to original so that antibodies could adapt)Source(s): https://en.wikipedia.org/wiki/Black_Death ; https://en.wikipedia.org/wiki/Black_Death#Second_p...
- Donnie PorkoLv 72 months ago
It’s still around but it’s been mutated to a less lethal form.
If it kills off too many people, then the virus would be extinct because there’s not enough host for it to live in. So it mutates into a less lethal form so that more hosts will survive which allows more virus to survive.
- iansandLv 72 months ago
The bubonic plague has not disappeared. It is endemic in Mongolian marmot populations among other places and there are regular human infections.