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The reason for the extinction of a number of civilizations 4 millennia ago were bacteria. This conclusion was reached by researchers who found deoxyribonucleic acid of microorganisms – provocateurs of plague and typhus, in the remains found during excavations.
Thus, experts studied thirty-two samples of deoxyribonucleic acid from dental pulp of ancient people who died from two thousand two hundred and ninety-ninth to one thousand nine hundred and ninety-ninth year BC.
As a result, two samples revealed deoxyribonucleic acid of the plague-causing bacillus. Another in a number of samples found Salmonella enterica, provoking typhoid fever.
