7 Deadliest Bacteria on Earth

Image: Mattosaurus

E. Coli

Bacteria are the pathogens that cause deadly illness and disease in their human hosts. Millions of people every year die because of these tiny living beings that multiply in our system and take advantage of any weaknesses they find. Defining “deadly bacteria” is difficult because there are many factors, including do you look at what has killed the most in history, or the bacteria that is fatal without treatment but made innocuous with treatment? That said, here are some amazing photographs of deadly bacteria in our world.

Image: Rocky Mountain Laboratories, NIAID, NIH

7) Salmonella


Salmonella is deadly in two forms, both the enterica and the typhi. Salmonella typhi causes typhoid fever, which is responsible for the death of 216,000 persons a year in endemic areas. It is spread through feces and urine contamination. Some people are asymptomatic carriers like the famous typhoid patient Mary who was responsible for infecting 53 people and died in quarantine as the first asymptomatic carrier ever to be quarantined in the U.S.