Why a broken mirror can cause seven years of bad luck?

Why a broken mirror can cause seven years of bad luck?

This is the myth, and sometimes for the explanation for this myth has been offered that sometimes king was observing rooms behind the one-side mirror, and if the person would break the mirror, the surveillance room behind the mirror would be uncovered. But there is one very interesting and at the same time a horrifying explanation for that thing.

If behind the mirror glass would be an anaerobic bacteria, and the mirror would be broken, could that bacteria released in the room. When we are thinking the case that there could be some kind of tensions in the class, the change of the temperature would cause that the glass will be broken. The thing is that most of the anaerobic bacteria would cause a very dangerous eruption and if those bacteria would be released to the room, would the result be horrifying.

When we are thinking about the cases, where bacteria has no nutrient, they would many times go in the resting spore, and when they are facing the food or some chemicals, they would wake up. This is how anthrax-bacteria will work, and those resting spores can infect a person even hundreds of years after they have gone in the hibernation.  Also, other bacteria are making this, and if the botulinum bacteria would get in the mouth or nose, it would start to create the nervous poison, what is the most lethal in nature. So this kind of things might be caused the tale about bad luck, what is connected to the broken mirrors.