Some types of Gram-negative bacteria including Escherichia coli, Vibrio cholerae and Yersinia pestis. These bacteria are responsible for food-borne diseases, cholera and plague, respectively. Many types of Gram-negative bacteria have grown resistant to antibiotic drugs.
Hospitals post a major threat for Gram-negative bacteria transmission. Bacteria enter patient's bodies through catheters, wounds or ventilators. Some effective ways to prevent transmission include wearing gloves and gowns in hospitals and requiring hand washing.
Gram-negative bacteria are defined by the lack of staining of crystal violet dye in the Gram stain protocol. Bacteria that are Gram-negative appear pink or red whereas Gram-positive bacteria retain the purple stain.