Strep throat, food poisoning and anthrax are all diseases caused by bacteria.Streptococcal bacteria is the bacteria that is responsible for the disease strep throat. The name of the bacteria is called Streptococcus Pyogenes is the name of the bacteria.Numerous harmful bacteria are mainly responsible for causing food poisoning.Bacillus Anthracis is the main culprit in case of causing the disease anthrax. So we can easily see a coomon criterion that is present in all the cases. the common criterion is bacteria.