

It is not actually a vaccine. It just puts your immune system in high alert.
If this was beneficial on the long run, evolution would have reached this point long ago and kept the immune system on this level on its own. The simple fact that it does not tells me that there are probably disadvantages that outweight the benefits.
My guess is that this stuff also raises autoimmune issues and allergies.








Evolution tests many paths and takes the one that benefits the species in the long run. Simply by the better equipped producing more viable offspring.
An immune system on permanent alert probably makes autoimmune problems worse, and may exhaust all kinds of resources. Both would have to be balanced with the benefit of not having a runny nose.