What are you talking about? Its normal to have virus transmission from one animal to another (Human is no exception). Its effects on that particular animal depend on its immune system. Spanish flu origin was tracked backed to the mixing of birds and swine to humans. \
Here is a list of all
zoonosis diseases.
SARS-CoV was precisely tacked backed to the local market in Guangdong, China. This is no new instance.
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You should check out this Vox
clip explaining how the liberal wild animal trade and in china could be the underlying reason for multiple outbreaks from china.
Our inherent bias wants us to be this kind of conspiracy narrative to be true. But often its not.
As I mentioned earlier everybody suffers from all kinds of bias including you and me.
The best way forward is to be open to all possibilities rather than coming to any individual conclusions.
Nobody has the intelligence or the aptitude or the information to make a definite call , rather at best put forward possibilities.
Anyways I was digging around and I found out something interesting , virus can be engineered perse without actually " enginnering " them . Ie make them seem like a natural mutation .
RNA viruses like from corona family have high mutation rate ,
Say one needs to release a bioagent without any footprint of it being human engineered
First one needs to identify a suitable virus candidate meeting your initial expectations , this is not a small task , requires lot of resources and data.
Very simplistically speaking say you identified and selected the one found in bats as your best option.
Next you need hundreds of animal test subjects with suitable external stimuli ( via trial and error ) to enhance the already high natural mutation rate of RNA virus. There will be significant no of naturally ( plus externally induced ) mutations within a span of 100 generations , beauty is none is engineered ie direct modification of the virus.
Then you need to select the strain which you find more suitable to adapt to humans .
Then you will need human test subjects to make sure that the selected strain has adapted to human and shows the required virulence and fatality .
Now you simply release the test subjects , I will choose the animal test subjects with the final selected strain for better chances of plausible deniability. Again beauty is none is engineered ie direct modification of the virus.
Finally understand that what I have presented here is a possibility not a definite conclusion like others are doing.