Which of the following pathogens are classified as one of the four types of foodborne pathogens?

Bacteria are classified as one of the four main types of foodborne pathogens because they are microorganisms that can cause foodborne illnesses when they contaminate food and multiply to harmful levels. Common examples include Salmonella, E. coli, and Listeria. These bacteria can produce toxins, lead to infections, and result in various gastrointestinal issues when consumed.

The other options do not fall under the primary categories of foodborne pathogens. Algae, while they can produce harmful toxins, are not categorized as pathogens in the same way as bacteria. Insects can carry pathogens but are not pathogens themselves. Worms, although they can cause foodborne illness through parasitic infections, are typically not classified as one of the primary types like bacteria, viruses, or fungi. Therefore, bacteria's role in food safety and illness makes it a crucial focus in understanding foodborne pathogens.