Researchers took a selection of 14 foodborne pathogens and compared them based on the number of illness caused, the number of hospitalizations, the cost of illness and what's known as the cost to a person's quality of life. One by one, the pathogens demonstrated their abilities and slowly, several started to emerge from the rest of the pack, leaving a top five.
During the second mission to the moon in 1969, Apollo 12, the crew brought back a camera that had been sent some two and a half years earlier. When they returned, the camera underwent extensive testing including microbiological analysis. Much to their surprise, they found a colony of earthly bacteria; apparently the microbes had survived the inhospitable lunar environment.