The sentimental story with Danish minks turned into a sentimental one precisely because the virus used the animals as an incubator.
In such an incubator, the virus accumulates various mutations.
It may seem that mutations are bad, but in fact, mutations give rise to the variability that drives evolution.
That is, there are many, many different new changes, some of which will be useful, and some will not. If the change is beneficial, then such an organism will multiply and pass on its new qualities to its offspring.
It turns out that if you make more mutations to the virus, then the virus will begin to evolve and can become more dangerous.
Mutations appear where the virus lives for a long time and does not die. Danish minks turned out to be a collective incubator in which the virus circulated, had fun as it wanted and accumulated various new mutations. It was dangerous, which is why the incubator was dealt with so brutally.
Roughly the same story takes place inside people who have very weak immunity. In such people, the virus lives for months and has time to try many different mutations.
Well, roughly speaking, if a virus gets into a strong person and decides to mutate, then the immune system will quickly kill this virus, and he will not have time to try anything.
But if a person is not all right with immunity, then the virus will try one mutation, then, like new pants, it will try on another mutation. One and the same virus will continuously pick up such mutations for several months. Like a thief who picks the lock with different master keys.
If there is enough time, the virus will pick up the right master key, open our lock and blow us to smithereens.
It turns out that people with poor immunity become an incubator in which the virus has fun and accumulates strength. Such people should be protected, not coughing on them and, probably, vaccinated. If we allow the virus to attack the weak, then it will emerge from them in the form of a dangerous mutant. Get vaccinated and reduce the number of viruses!
