After running this experiment, you find that the carrots you tested had only 15 bacteria/ml. Your lab partner states that this number is so low that the carrots do not need further treatment. Why should you disagree?
a) None of the available answers are correct.
b) Since these organisms are Gram negative, they are definitely pathogenic, so even a small dose could cause disease.
c) The 15 bacteria are resistant to the erythromycin, methicillin, and bacitracin found in EMB agar.
d) A low number of organisms does not indicate the absence of pathogens.