Which of the following is an example of a bacterial pathogen?

Escherichia coli (E. coli) is a well-known bacterial pathogen that can cause various infections in humans, including gastrointestinal illnesses and urinary tract infections. Some strains of E. coli, particularly O157:H7, are notable for causing severe foodborne disease and can lead to serious health complications. This bacterium resides in the intestines of humans and animals and, while many strains are harmless, some can become pathogenic under certain conditions, especially when transmitted through contaminated food or water.

In contrast, the other organisms listed represent different types of pathogens. Plasmodium species are protozoan parasites responsible for malaria and are transmitted through mosquitoes. Candida auris is a fungus that can cause invasive infections, particularly in healthcare settings. Hepatitis A is a viral infection affecting the liver, transmitted primarily through the fecal-oral route. Thus, E. coli stands out specifically as a bacterial pathogen among the choices provided.