Which type of contamination is caused by food handlers not washing their hands?

Biological contamination occurs when harmful microorganisms such as bacteria, viruses, or parasites are introduced into food. This type of contamination is directly linked to improper food handling practices, such as food handlers failing to wash their hands after using the restroom or handling raw foods. When hands are not washed properly, pathogens present can easily transfer to food items, leading to foodborne illnesses.

This specific scenario exemplifies how human actions contribute to the spread of microorganisms, making it vital for food handlers to practice proper hygiene. In contrast, other types of contamination, such as chemical or physical contamination, involve different sources and causes, such as the presence of toxic substances or foreign objects, rather than the direct transfer of harmful organisms via inadequate handwashing.